Method and apparatus for transmitting/receiving data using multiple carriers in mobile communication system

ABSTRACT

The present invention relates to a method and an apparatus for transmitting/receiving using multiple carriers in a mobile communication system. A method for transmitting/receiving data by a terminal using multiple carriers in a mobile communication system according to the present invention comprises the steps of: receiving a serving cell addition control message including uplink subframe pattern information on a master serving cell group or a slave serving cell group from a base station; establishing synchronization with a serving cell included in the serving cell addition control message; and, when a command for activating the serving cell with which the synchronization is established is received, transmitting/receiving data to/from the base station through the added serving cell.

TECHNICAL FIELD

The present specification relates to a mobile communication system. Morespecifically, the present invention relates to a method and an apparatusfor transmitting/receiving data using multiple carriers in a mobilecommunication system.

BACKGROUND ART

In general, mobile communication systems have been developed to providecommunication while securing the mobility of users. With the rapiddevelopment of technologies, mobile communication systems have reached astage of providing high-speed data communication services as well asvoice communication.

Currently, a standardization operation from a 3rd Generation PartnershipProject (3GPP) system to a Long Term Evolution (LTE) system isprogressing as one of the next generation mobile communication systems.The LTE system is a technology for implementing a high-speed packetbased communication having a transmission speed up to 100 Mbps, which ishigher than a currently provided data transmission rate, and currently,a standardization of the LTE system is almost finished.

Recently, a discussion for an LTE-Advanced (LTE-A) which improves atransmission speed by combining various new technologies in the LTEcommunication system is progressing. As a representative technologyamong newly employed technologies, there is a carrier aggregation. Inthe carrier aggregation, one terminal uses multiple forward carriers andmultiple backward carriers, differently in the prior art in which aterminal transmits/receives data using one forward carrier and onebackward carrier.

Currently, only an inter-ENB carrier aggregation is defined in theLTE-A. This causes the application possibility of the carrieraggregation capability to decrease, and thus may cause a problem inwhich a macro cell and a pico cell cannot be aggregated in a scenariowherein multiple pico cells and one macro cell are overlapped andoperated.

DISCLOSURE OF INVENTION Technical Problem

An embodiment of the present specification is invented to at least someof the above-mentioned problems, and is to provide a method and anapparatus for different inter-ENB carrier aggregation.

Solution to Problem

A method of transmitting/receiving data by a terminal using multiplecarriers in a mobile communication system of the present invention forsolving the above-mentioned problems comprises: receiving a serving celladdition control message including uplink subframe pattern informationon a master serving cell group or a slave serving cell group from a basestation; establishing synchronization with a serving cell included inthe serving cell addition control message; and transmitting/receivingdata to/from the base station through the added serving cell when acommand for activating the serving cell with which the synchronizationis established is received.

In this case, the uplink subframe pattern information may include atleast one of information on a subframe to which an uplink transmissionfor the master serving cell group is admitted, information on a subframeto which an uplink transmission for the slave serving cell group isadmitted, and information on a subframe to which an uplink transmissionis not admitted.

In addition, the length of the uplink subframe pattern may be determinedbased on a Hybrid Automatic ReQuest (HARQ) Round Trip Time (RTT).

According to an embodiment of the present invention, the uplink subframepattern information may include at least one of bit informationindicating a subframe to which an uplink transmission for the masterserving cell group is admitted, bit information on a subframe to whichan uplink transmission for the slave serving cell group is admitted, andoffset information indicating a start of a subframe pattern.

According to another embodiment of the present invention, the uplinksubframe pattern information may be pattern index information indicatingone pattern among multiple subframe patterns having a predeterminedlength.

Meanwhile, a terminal for transmitting/receiving data using multiplecarriers in a mobile communication system comprises: atransmitting/receiving unit that transmits/receives a signal to/from abase station; and a control unit that controls to receive a serving celladdition control message including uplink subframe pattern informationon a master serving cell group or a slave serving cell group from a basestation, to establish synchronization with a serving cell included inthe serving cell addition control message, and to transmit/receive datato/from the base station through the added serving cell when a commandfor activating the serving cell with which the synchronization isestablished is received.

Advantageous Effects of Invention

According to an embodiment of the present specification, a carrier isaggregated between different base stations, and thus thetransmission/reception speed of a terminal can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view illustrating a structure of an LTE system to which someembodiments of the present specification are applied;

FIG. 2 is a view illustrating a structure of a wireless protocolstructure in the LTE system to which some embodiments of the presentspecification are applied;

FIG. 3 is a view illustrating a carrier aggregation in an ENB to whichsome embodiments of the present specification are applied;

FIG. 4 is a view illustrating a carrier aggregation method according toan embodiment of the present specification;

FIG. 5 is a view illustrating an inefficient PUSCH transmission due to awrong configuration of the length of a pattern;

FIG. 6 is a view illustrating a preferable pattern configuration;

FIG. 7 is a flowchart of operations of a UE and an eNB configuring anSCell in an MSCG;

FIG. 8 is a flowchart of operations of the UE and the eNB configuring anSCell in an SSCG;

FIG. 9 is a configuration diagram of an RRC control message according toan embodiment of the present specification;

FIG. 10 is a configuration diagram of an RRC control message accordingto another embodiment of the present specification;

FIG. 11 is a view illustrating a CQI transmission subframe determinedthrough a subframe pattern and CQI configuration information;

FIG. 12 is a view illustrating an operation of a UE determining whethera PUCCH CQI is transmitted or not in a random subframe n;

FIG. 13 is a view illustrating an operation of a UE determining whetheran SRS is transmitted or not in a random subframe n;

FIG. 14 is a view illustrating an operation of a UE transmitting an SRwhen a buffer status report is triggered;

FIG. 15 is a view illustrating an operation of a UE performing a randomaccess;

FIG. 16 is a flowchart illustrating operations of a UE and an eNB, inwhich the UE reports a capability and the eNB configures an inter-eNBCA;

FIG. 17 is a view illustrating a configuration of capability reportinformation of a UE;

FIG. 18 is a view illustrating a case wherein an MSCG subframe and anSSCG subframe are overlapped;

FIG. 19 is a view illustrating a structure of a UE according to anembodiment of the present specification;

FIG. 20 is a view illustrating a structure of an eNB according to anembodiment of the present specification;

FIG. 21 is a view illustrating a structure of a slave eNB according toan embodiment of the present specification;

FIG. 22 is a view illustrating an operation of a UE according to anembodiment of the present specification when a random access is failed;

FIG. 23 is a view illustrating an example of a measurementconfiguration;

FIG. 24 is a view illustrating an operation of a UE handling an SCell asa serving cell or a peripheral cell according to a measurement reportconfiguration;

FIG. 25 is a view illustrating a case wherein an initial transmissionand a retransmission are conflicted on a time axis;

FIG. 26 is a view illustrating a UE operation when the initialtransmission and the retransmission are conflicted on a time axis;

FIG. 27 illustrates an operation of a UE receiving an RRC controlmessage;

FIGS. 28A and 28B illustrate a UE operation when a regular BSR istriggered;

FIG. 29 illustrates an operation of a UE determining a cell triggering arandom access according to a direction of an eNB;

FIG. 30 illustrates formats of a PHR; and

FIG. 31 illustrates an operation of the UE.

MODE FOR THE INVENTION

In the following description, a detailed description of knownconfigurations or functions incorporated herein will be omitted when itis determined that the detailed description makes the subject matter ofthe present disclosure unclear. Hereinafter, embodiments of the presentdisclosure will be described with reference to the accompanyingdrawings. Hereinafter, before describing the present specification, anLTE system and a carrier aggregation is schematically described.

FIG. 1 is a view illustrating a structure of an LTE system in which someembodiments of the present specification are applied.

Referring to FIG. 1, a wireless access network of the LTE systemincludes a next generation base station (i.e., Evolved Node B,hereinafter, ENB, Node B or base station) 105, 110, 115 and 120, aMobility Management Entity (MME) 125 and a Serving-GateWay (S-GW). AUser Equipment (hereinafter, a UE or terminal) 135 is connected to anexternal network through the ENB 105, 110, 115 and 120.

In FIG. 1, the ENB 105, 110, 115 and 120 correspond to the existing nodeB of a UMTS system. The ENB 105, 110, 15 or 120 is connected with the UE135 through a wireless channel, and performs a more complicated rolethan the conventional node B. In the LTE system, all user traffic, suchas a real time service such as a Voice over IP (VoIP) through aninternet protocol are serviced through a shared channel, therefore, adevice which collects and schedules state information such as a bufferstate, a capable transmission power state, and a channel state isnecessary, and the ENB 105, 110, 15 or 120 take charge of this. One ENBgenerally controls a plurality of cells. In order to implement atransmission rate of 100 Mbps, the LTE system uses an OrthogonalFrequency Division Multiplexing (OFDM) as a wireless access technologyin a bandwidth of 20 MHz. In addition, an Adaptive Modulation & Coding(AMC) method which determines a modulation scheme and a channel codingrate that is suitable for a channel state of the terminal is employed.The S-GW 130 is a device for providing a data bearer, and generates orremoves the data bearer under a control of the MME 125. The MME is adevice for managing the mobility of the terminal and taking charge ofvarious control functions and is connected to multiple ENBs.

FIG. 2 is a view illustrating a structure of a wireless protocolstructure in the LTE system to which some embodiments of the presentspecification are applied.

Referring to FIG. 2, the UE and the ENB includes a Packet DataConvergence Protocol (PDCP) 205 or 240, a Radio Link Control (RLC) 210or 235, a Medium Access Control (MAC) 215 or 230 respectively, as thewireless protocol of the LTE system. The PDCP 205 or 240 performs anoperation such as an IP header compression/recovery, and the RLC 210 or235 reconstructs a PDCP Packet Data Unit (PDU) to a proper size toperform an ARQ operation and so on. The MAC 215 or 230 is connected withvarious RLC layer devices configured in one UE, and performs amultiplexing of RLC PDUs to MAC PDU and a de-multiplexing of the RLCPDUs from the MAC PDU. The PHY layers 220 and 225 perform an operationof channel-coding and modulating higher layer data to generate an OFDMsymbol and transmitting the OFDM symbol through a radio channel ordemodulating and channel-decoding the OFDM symbol received through theradio channel and transmitting the demodulated and channel-decoded OFDMsymbol to the higher layer.

FIG. 3 is a view illustrating a carrier aggregation in the ENB to whichsome embodiments of the present specification are applied.

Referring to FIG. 3, one ENB generally may transmit and receive multiplecarriers through various frequency bands. For example, when a carrier315 of which a forward center frequency is f1 and a carrier 310 of whicha forward center frequency is f3 are transmitted, in the prior art, oneterminal transmits and receives data using one carrier of two carriers.However, a terminal having a carrier aggregation capability maytransmits/receives the data using multiple carriers simultaneously. TheENB 305 may allocate more carriers to the UE 330 with the carrieraggregation capability according to circumstances, so as to improve thetransmission rate of the UE 330. The aggregation of the forward carrierand the backward carrier which are transmitted and received by the oneENB as described above is referred to as an inter-ENB carrieraggregation. However, according to an occasion, it may be necessary toaggregate a forward carrier and a backward carrier which are transmittedand received by different base stations differently as shown in FIG. 3.

FIG. 4 is a view illustrating a carrier aggregation method according toan embodiment of the present specification.

Referring to FIG. 4, when a ENB 1 405 transmits/receives a carrier ofwhich a center frequency is f1 and a ENB 2 420 transmits/receives acarrier of which a center frequency is f2, if a UE 430 aggregates (orcombines) the carrier of which a forward center frequency is f1 and aforward center frequency is f2, one UE aggregates carrierstransmitted/received by two or more ENBs, and this is referred to as aninter-ENB carrier aggregation (or an inter-ENB CA) in the presentspecification.

Below, terms frequently used in the present specification are described.

When one forward carrier transmitted by one ENB and one backward carrierreceived by the ENB forms one cell, the carrier aggregation may beunderstood as a transmitting/receiving data through multiple cellssimultaneously by the UE as a traditional meaning. Through this, themaximum transmission speed is increased in proportion to the number ofthe aggregated carriers.

Hereinafter, in the present specification, receiving data through arandom forward carrier or transmitting data through a random backwardcarrier has a meaning equal to transmitting and receiving data using acontrol channel and a data channel provided in a cell corresponding to acenter frequency and a frequency band characterizing the carrier. In thepresent specification, specially, the carrier aggregation is expressedas a configuration of multiple serving cells, and a Primary serving Cell(PCell), Secondary serving Cell (Scell), an activated serving cell andthe like are used. The above terms have meanings thereof used in an LTEmobile communication system. In the present invention, terms of acarrier, a component carrier, a serving cell and the like may be mixed.

In the present specification, a group of serving cells controlled by thesame ENB is defined as a Serving Cell Group (SCG). The SCG is againdivided into a Master Serving Cell Group (MSCG) and a Slave Serving CellGroup (SSCG). The MSCG means a group of serving cells controlled by anENB (hereinafter, a Master eNB, or MeNB) controlling the PCell, and theSSCG means a group of serving cells controlled by an ENB (hereinafter,Slave eNB, or SeNB) controlling an eNB, not the eNB controlling thePCell, that is an eNB controlling only the SCell. A predeterminedserving cell is configured in a procedure configuring a correspondingserving cell by an ENB whether the predetermined serving cell isincluded in the MSCG or the SSCG. One MSCG and at least one SSCG may beconfigured in one UE, and in the present invention, for the convenienceof description, only a case in which one SSCG is configured isconsidered. However, although at least one SSCG is configured, contentsof the present invention may be applied as itself without a differentaddition or subtraction.

In the below description, for an understanding, another term may be usedinstead of the MSCG and SSCG. For example, a primary set and a secondaryset, a primary carrier group and a secondary carrier group, an MeNB CellGroup (MCG) and an SeNB Cell Group (SCG), or the like may be used.However, in this case, it should be noticed that only the terms aredifferent, but the meanings are the same. A main using object of theterms is for dividing a cell controlled by an eNB controlling the PCellof the specific UE. Operation methods of a UE and a corresponding cellmay be different in a case in which the cell is controlled by the eNBcontrolling the PCell of the specific UE and in a case in which the cellis not controlled by the eNB controlling the PCell of the specific UE.

At least one SCG may generally be configured in a UE, but in the presentinvention, for the convenience of description, it is assumed that onlyone SCG may be configured in the UE. The SCG may include multipleSCells, and one among the multiple SCells has a special nature.

In a CA of a normal eNB, a UE may transmit an HARQ feedback and a CSIfor the SCell as well as an HARQ feedback and a CSI for the PCellthrough a PUCCH of the PCell. This is for applying a CA for a UE, whichcannot possibly perform an uplink simultaneous transmission.

In the case of the inter-eNB CA, it may be impossible for transmittingthe HARQ feedback and the CSI of the SCells included in the SCG throughthe PUCCH of the PCell practically. This is because the HARQ feedbackshould be transmitted in a HARQ Round Trip Time (RTT) (e.g., normally 8ms), and a transmission delay between the MeNB and the SeNB may belonger than the HARQ RTT. A PUCCH transmission resource may beconfigured in one cell among the SCells included in the SCG and the HARQfeedback and the CSI for the SCG SCells may be transmitted through thePUCCH because of the above problem. The special SCell is referred to asa Primary SCell (PSCell) or a PUCCH SCell. Hereinafter, the inter-eNB CAand a dual connectivity are mixed.

A scheduler is installed in an eNB unit. It may not be easy to schedulemultiple eNBs such that transmission resources of the multiple eNBs arenot overlapped in a real time. Thus, a UE to which one or more SCG isconfigured may be controlled by one or more schedulers, and may receivean indication to perform a simultaneous backward transmission in servingcells included in different SCGs. Generally, since serving cells in thesame frequency band forms one SCG, when the simultaneous backwardtransmission is performed in the serving cells in different SCGs, aso-called an Inter-Modulation Distortion (IMD) problem may be generated.The IMD generation-or-not is closely related to the structure of a UE.For example, when a UE is operated in random f1 and f2, the structure ofthe UE may be classified as the following. The f1 or f2 is a frequencyspecified by a predetermined bandwidth based on one center frequency inthe case of a Time Division Duplex (TDD), and specifies a forwardfrequency specified in a predetermined bandwidth based on the forwardcenter frequency and a backward frequency specified in the predeterminedbandwidth based on a backward center frequency in the case of aFrequency Division Duplex (FDD).

-   -   2Rx/2Tx structure A: a structure using a separated Rx device, a        separated Tx device and a separated power amplifier for f1 and        f2, a forward simultaneous receiving is possible, and a backward        simultaneous transmission is possible without IMD problem.    -   2Rx/2Tx structure B: a structure using a separated Rx device, a        separated Tx device and a shared power amplifier for f1 and f2,        a forward simultaneous receiving is possible, and an IMD problem        is generated when a backward simultaneous transmission is used.    -   2Rx/1Tx structure: a structure using a separated Rx device and a        shared Tx device for f1 and f2, a forward simultaneous receiving        is possible, and a backward simultaneous transmission is        impossible.    -   1Rx/1Tx structure: a structure using a shared Rx device and a        shared Tx device for f1 and f2, both of a forward simultaneous        receiving and a backward simultaneous transmission are        impossible.

In the present invention, a UE reports information on a structureapplied according to a frequency band combination, and information onwhether the simultaneous transmitting and receiving are possible to thebase station. The base station schedules the terminal such that thesimultaneous backward transmission is not generated by scheduling theterminal without an exclusion of the simultaneous transmitting andreceiving based on the information or applying a Time Division MultiplexTDM method between the SCGs. Specially, when the eNB configures theserving cell in a frequency band combination in which the simultaneoustransmitting and receiving are impossible, the eNB allocates apredetermined pattern to the UE, and the UE performs a backwardtransmission between the SCGs in the TDM type according to the pattern.

The TDM pattern is configured as three types of subframes.

-   -   MSCG subframe: a subframe to which a backward transmission of        master serving cells is admitted    -   SSCG subframe: a subframe to which a backward transmission of        slave serving cells is admitted    -   Switching subframe: a subframe to which a backward transmission        is not admitted

Among the three types of TDM patterns, a reason for requiring theswitching subframe is because an RF device is re-adjusted such that theUE performs the backward transmission in the MSCG serving cell andperforms the backward transmission in the SSCG serving cell. A requiredperiod in the re-adjusting of the RF device may be different accordingto a structure, a hardware performance and the like of the UE. The UEmay report information on whether the switching subframe is necessaryand the time of a switching according to each frequency band combinationto the eNB.

When the 2Rx/1Tx structure or the 1Rx/1Tx structure is applied, in thecase of the switching, since a re-configuration of a Tx device isnecessary, a switching period of about several hundred micro seconds maybe necessary. When the 2Rx/2Tx structure B is applied, the Tx device isseparately used. Therefore, since only a path of a backward signal isadjusted in the case of the switching, a switching period shorter thanone OFDM symbol time (e.g., about 66.7 micro seconds) may be necessary.

Therefore, the applied structure, the position, the frequency and thelike of the switching subframe may have a close relation, and the UEprovides related information such that the eNB may place the switchingsubframe properly.

The MSCG subframe, the SSCG subframe, and the switching subframe have aregular period and are repeated in the same pattern. The length of thepattern is also an important factor influencing the performance.

The backward transmission includes various types, such as a PUSCH andPUCCH. Specially, a Hybrid Automatic ReQuest (HARQ) is applied to thePhysical Uplink Shared Channel (PUSCH) transmission, and the HARQoperation is specified by a time relation defined by the HARQ RTT. Thelength of the pattern is configured differently from the HARQ RTT, andthe HARQ operation becomes inefficient. For example, the length of thepattern is 10 subframe _505, a retransmission time point for a PUSCHtransmission _510 performed in a random master serving cell is an SSCGsubframe or a switching subframe, and thus a circumstance _515, _520 and_525 in which the PUSCH retransmission cannot be performed may begenerated.

In order not to generate the above problem, in the present invention,the length of the pattern is defined in consideration of the HARQ RTT.In a carrier aggregation operation (i.e., in a case in which multipleserving cells are configured and all of the serving cells are includedin an FDD band) corresponding to a combination between the FDD bands, apattern having a length of 8 subframes is used. In the combinationbetween TDD bands, a pattern having the following length is usedaccording to forward/direction configurations. In the TDD, 7 UL/DLconfigurations may exist as shown in Table 1. Table 2 shows a backwardHARQ RTT (i.e., a time between an HARQ initial transmission and an HARQretransmission) and the bitmap length according to each configuration.

TABLE 1 Downlink-to- Uplink- Uplink downlink Switch-point configurationperiodicity Subframe number 0 5 ms 1 5 ms 2 5 ms 3 10 ms  4 10 ms  5 10ms  6 5 ms

TABLE 2 Uplink- downlink Backward HARQ configuration RTT Bitmap length 011/13 ms   48 bit 1 10 ms 10 bit 2 10 ms 10 bit 3 10 ms 10 bit 4 10 ms10 bit 5 10 ms 10 bit 6 11/14 ms   50 bit

In Table 1, D indicates a forward subframe, U indicates a backwardsubframe, and S indicates a special subframe.

The backward HARQ RTT of backward/forward configurations is 10 ms, andthe length of the bitmap is 10 bits. The HARQ RTT of thebackward/forward configuration 0 and 6 is formed of two repetitivevalues. For example, in the configuration 0, the HARQ RTT is 11 ms in ann-th transmission, and the HARQ RTT is 13 ms in an (n+1)-thtransmission. The bitmap length is defined as a value obtained bymultiplexing 2 to a value obtained by an addition of two RTTs such thata flexible pattern configuration is possible. That is, in theconfiguration 0, 48 bits, which is twice of (11+13), is defined as thebitmap length, and in the configuration 6, 50 bits, which is twice of(11+14), is defined as the bitmap length.

FIG. 6 is a view illustrating a preferable pattern configuration.

It is preferable to configure a pattern such that the patterns of eachUE are not overlapped so as not to waste transmission resources of theMSCG and the SSCG. For example, it is preferable to configure _605 theswitching subframe to a UE, the MSCG subframe to another UE, and theSSCG subframe to further another UE, as a random subframe intransmission resource efficiency. To this end, start time points of thepatterns are configured differently according to each UE.

In the present invention, the following three pieces of information aretransferred to the UE to configure the specified pattern according toeach UE as described above.

-   -   Bitmap 1: The bitmap 1 has a predetermined length, and each bit        specifies whether the subframe is the MSCG subframe or not. For        example, 1 means the MSCG subframe. The length is 8 bits in the        CA of the FDD band, the length is 10 bits, 48 bits, or 50 bits        in the CA of the TDD band.    -   Bitmap 2: The bitmap 2 has the length equal to that of the        bitmap 1, each bit specifies whether the subframe is the SSCG        subframe or not.    -   Offset: The offset is information specifying a start subframe of        the subframe pattern, and the size of the offset is determined        by a value obtained through a log operation of the bitmap        length. For example, when the size of the bitmap is 8 bits, the        size of the offset is Ceiling [Log 2(8), 1]=3 bits, and when the        size of the bitmap is 10 bits, the size of the offset is Ceiling        [Log 2(10), 1]=4 bits.

The subframe pattern is determined by the bitmap 1 and the bitmap 2. Inthe bitmap 1, for example, a subframe indicated by 1 as a predeterminedvalue indicates the MSCG subframe. In the bitmap 2, a subframe indicatedby the predetermined value indicates the SSCG subframe. In all of thebitmaps, for example, a subframe indicated by 0 as another predeterminedvalue indicates the switching subframe.

For example, a pattern of a UE A is defined as the MSCG subframe, theMSCG subframe, the MSCG subframe, the switching subframe, the SSCGsubframe, the SSCG subframe, the SSCG subframe and the switchingsubframe as shown in _610, the bitmap 1 may be defined as 11100000, andthe bitmap 2 may be defined as 00001110.

In this case, the first, second and third subframes are indicated as 1in the bitmap 1, and thus the first, second and third subframes may bethe MSCG subframes. The fifth, sixth and seventh subframes are indicatedas 1 in the bitmap 2, and thus the fifth, sixth and seventh subframesmay be SSCG subframes. The fourth and eighth subframes are indicated as0 in both bitmaps, and thus the fourth and eighth subframes may indicatethe switching subframes.

Meanwhile, according to another embodiment of the present invention, thesubframe pattern may be defined by an index instead of theabove-mentioned two bitmaps. For example, in the FDD, the pattern indexis defined as shown in Table 3, and the index may be signalized.

TABLE 3 Pattern index Subframe pattern 0 M/M/M/s/S/S/S/s 1M/s/S/S/S/S/S/S/s 2 M/M/s/S/S/S/S/s . . . . . .

A capital M means the MSCG subframe, a capital S means the SSCGsubframe, and a small letter s means the switching subframe.

When the subframe pattern is determined using the bitmaps 1 and 2 or thepattern index, the UE calculates a reference subframe (or startsubframe) of the subframe pattern using the offset by Equation 1.(10*SFN+subframe number)MOD(pattern length)=offset  [Equation 1]

For example, in the FDD band combination, when 6 is signalized as theoffset, the subframes in which the pattern is started are the same asthe following.

[SFN=0, subframe number=6], [SFN=1, subframe number=4], [SFN=2, subframenumber=2], . . . .

FIG. 7 is a flowchart illustrating an operation sequence of the UE andthe eNB configuring the SCell included in the MSCG according to anembodiment of the present specification.

Hereinafter, for the convenience of description, the serving cell in theMSCG is marked as a serving cell_m, and the serving cell in the SSCG ismarked as a serving cell_s.

Referring to FIG. 7, a mobile communication system may include a UE 705,an eNB 1 710 and an eNB 2 715.

A cell a, a cell b and a cell c are controlled by the eNB 2 715, and acell d and a cell e are controlled by the eNB 1 710. It is assumed thatthe PCell of the UE is the cell a.

According to the above-mentioned term definition, the eNB 1 715 is theMeNB. The eNB 1 715 which is the MeNB configures the cell b as anadditional SCell to the UE. In this case, the MeNB 715 storesinformation related to the newly added SCell in a Radio Resource ControlConnection Reconfiguration control message and transmits the informationto the UE 705 (step 720). The newly added SCell is a cell that isdirectly managed by a serving eNB, and at least one piece of informationshown in the following Table 4 is stored in the control message.

TABLE 4 Name Description sCellIndex-r10 The sCellIndex-r10 is anidentifier of the serving cell. The sCellIndex-r10 is an integer havinga predetermined size. sCellIndex-r10 is used when information on acorresponding serving cell is updated later. cellIdentification- ThecellIdentification-r10 is information r10 identifying a serving cellphysically. The cellIdentification-r10 includes forward center frequencyand Physical Cell ID (PCI). radioResourceConfig TheradioResourceConfigCommonSCell-r10 is CommonSCell- information relatedto wireless resources of r10 the serving cell. For example, a forwardbandwidth, forward HARQ feedback channel configuration information,backward center frequency information, backward bandwidth information,and the like are included in here. radioResourceConfig TheradioResourceConfigDedicatedSCell-r10 is DedicatedSCell- information onexclusive resources allocated r10 to the UE in the serving cell. Forexample, reference signal structure information for channel qualitymeasurement, inter-carrier scheduling configuration information, and thelike are included here. TAG (Timing The TAG is information indicating aTAG in Advance Group) which the UE is included. This may include,information for example, TAG id and a Timing Advance (TA). If the UE isincluded in a Primary TAG (P-TAG), this information is not signalized.

Among the parameters, the TAG is a group of the serving cells sharingthe same backward transmission timing. A type of the TAG includes aPrimary TAG (P-TAG) and a Secondary TAG (S-TAG). The P-TAG is a TAG inwhich the PCell is included, and the S-TAG is a TAG configured with onlythe SCell. An inclusion of a random serving cell in a random TAG meansthat the backward transmission timing of the serving cell is the same asthe backward transmission timing of other serving cells included in theTAG, and means that a backward synchronization-or-not is determined by aTA timer of the TAG.

The backward transmission timing of the random TAG is established by aperformance of a random access process in a predetermined serving cell,and is maintained by receiving a TA command. The UE drives or re-drivesthe TA timer of a corresponding TAG whenever the UE receives the TAcommand with respect to the random TAG. When the TA timer is expired,the UE determines that the backward transmission synchronization of thecorresponding TAG is lost, and does not perform the backwardtransmission until the UE performs the random access again. As shown inTable 4, when the SCell of the same serving cell group is added, theabove-mentioned pattern related information is not used. This is becauseit is possible for the scheduler to schedule so as not to overlap thebackward transmission mutually, since the serving cell configured in theUE is controlled by the same scheduler.

The UE 705 transmits an RRC connection reconfiguration complete for thecontrol message (step 725). The UE 705 establishes forward/downlinksynchronization for the cell b, that is the serving cell (730). Theforward/downlink means that the eNB transmits and the UE receives, andthe backward/uplink means that the UE transmits and eNB receives. In thepresent specification, ‘forward’ and ‘downlink’ are mixed as the samemeaning. In addition, in the present specification, ‘backward’ and‘uplink’ are mixed as the same meaning. The establishing of the forwardsynchronization for the random cell means that a synchronization channelof the cell is obtained to recognize a forward frame boundary, and thelike.

The MeNB 715 transmits an Activate/Deactivate MAC Control Element (A/DMAC CE) which is a MAC hierarchy control command for activating theSCell 1 to the UE at a random time when the MeNB 715 determines that theUE 705 finishes the configuration of the SCell 1 (735).

The control command may be formed of a bitmap. In the bitmap, forexample, a first bit may correspond to an SCell 1, a second bit maycorrespond to an SCell 2, and an n-th bit may correspond to an SCell n.Each of the bits indicates an activation/deactivation of a correspondingSCell. The bitmap may have 1 byte size. Since the index of the SCellincludes 7 indices of 1 to 7, a first Least Significant Bit (LSB) of thebyte is not used, a second LSB may be mapped with the SCell 1, a thirdLSB may be mapped with the SCell 2, and the last LSB (or MostSignificant Bit (MSB)) may be mapped with the SCell 7.

The UE 705 starts a monitoring of a Physical Downlink Control Channel(PDCCH) of the SCell 1 from a predetermined time that is elapsed basedon a time when the activation command for the SCell 1 is received. ThePDCCH is a channel providing forward/backward transmission resourceallocation information and the like.

If the SCell 1 is included in a TAG of which the synchronization isestablished in advance, the UE 705 starts forward/backwardtransmission/reception from the monitoring start time. If the SCell 1 isnot included in the TAG of which synchronization is not established, theUE 705 starts a reception of the forward signal at the monitoring starttime, and the UE 705 does not perform the backward signal transmission.That is, the UE 705 receives forward data when the forward transmissionresource allocation information is received through the PDCCH. However,the UE 705 ignores the backward transmission resource allocationinformation even though the UE 705 receives the backward transmissionresource allocation information. If the SCell 1 is not included in theTAG of which synchronization is not established, the UE waits until theUE receives a random access command from a predetermined SCell includedin the TAG through the PDCCH. The random access command is aconfiguration of a predetermined field as a predetermined value of abackward grant (which allocates backward transmission resources and thelike to the UE using scheduling information transmitted through thePDCCH). The random access command indicates a transmission of apredetermined preamble in a predetermined serving cell to the UE. Anidentifier of a serving cell performing the preamble transmission may beindicated in a Carrier Indicator Field (CIF) of the random accesscommand.

Next, in step 740, the UE 750 receives the random access command whichindicates the transmission of the random access preamble through theserving cell 1. In step 745, the UE 705 transmits the indicated preamblethrough the SCell 1 and monitors the PDCCH of the PCell so as to receivea Random Access Response (RAR) which is a response message to thepreamble. In the RAR, a Timing Advance or Timing Adjustment (TA) commandand other pieces of control information are stored. If a cell throughwhich the preamble is transmitted is the serving cell_m, when theresponse to the preamble is performed in the PCell, since the RARreception is performed in only PCell, there are merits in which a PDCCHmonitoring load of the UE 705 is reduced. The UE 705 monitors the PDCCHof the PCell in order to receive the RAR in step 750. When the UE 505receives an effective response message to the preamble transmitted instep 745, the UE 705 determines that the backward signal transmission ispossible after a predetermined time is elapsed from the time point. Forexample, when the UE 705 receives the effective RAR in an n-subframe,the UE determines that the backward transmission is possible from an(n+m)-th frame. The UE performs the forward/backward datatransmission/reception until the serving cell is released ordeactivated, in the newly configured serving cell.

FIG. 8 is a flowchart illustrating a process of configuring the SCellincluded in the SSCG, that is the serving cell_s.

FIG. 7 is a process for adding the carrier in the same eNB, and FIG. 8illustrates a process for adding a carrier in different eNBs.

The MeNB 815 determines that the MeNB 815 adds the SCell to the UE 805at a random time (820). Specially, when the UE 805 is located in an areaof a cell controlled by an eNB 1 810, the MeNB 815 determines that theMeNB 815 adds the cell controlled by the eNB 1 810 as the SCell in step820. Next, the MeNB 815 transmits a control message for requiring anSCell addition to an eNB 2 810 (825). In the control message, at leastsome of information described in the following Table 5 may be stored.

TABLE 5 Name Description SCell id The SCell id information isinformation information related to identifiers of the SCells configuredin the SeNB. The SCell id information includes at least one sCellIndex-r10. The MeNB determines the sCellIndex-r10 and informs of thesCellIndex-r10 to the SeNB in order to prevent a reuse of a previouslyused identifier. Alternatively, an area of an SCell id used by the MeNBand an area of an SCell id used by a drifty eNB may be divided anddefined. For example, SCell id 1 to 3 and SCell id 4 to 7 may be definedin advance such that the SCell id 1 to 3 are used by the MeNB and theSCell id 4 to 7 are used by the SeNB. TAG id The TAG id information isinformation related information to an identifier of a TAG configured inthe SeNB. The MeNB determines the TAG id information and informs of theTAG id information to the SeNB in order to prevent a reuse of apreviously used identifier. Backward The backward scheduling relatedinformation scheduling includes priority information of logical relatedchannels configured in the UE and logical information channel groupinformation. The SeNB uses this information to interpret buffer statereport information of the UE and perform a backward scheduling.Offloaded The offloaded bearer information is a service bearer requiredin high capacity data information transmission/reception in the SeNB.For example, it is preferable to process a service such as an FTPdownload. The MeNB determines a bearer which is offloaded to the SeNB,among bearers configured in the UE, and transfers information related tothe offloaded bearer, for example, a DRB identifier, PDCP configurationinformation, RLC configuration information, request Qos information, andthe like to the SeNB. Call response The MeNB provides referenceinformation such control related that the SeNB determines whether anSCELL information addition request is accepted or rejected.

When the SeNB 810 receives an SCell addition request control message,the SeNB 810 determines whether the SeNB accepts the request or not inconsideration of a current load situation and the like. When the SeNB810 determines that the SeNB 810 accepts the request, the SeNB 810generates a control message which stores at least some among informationof the following Table 6 and transmits the control message to the MeNB815 (830).

TABLE 6 Name Description SCellToAddMod The SCellToAddMod is informationon the SCells configured in the SeNB, and includes pieces of informationsuch as the following. sCellIndex-r10, cellIdentification-r10,radioResourceConfigCommonSCell-r10,radioResourceConfigDedicatedSCell-r10, TAG related information PUCCH Inat least one SCell among the SCells in the configuration SSCG, thePhysical Uplink Control Channel information for (PUCCH) is configured.The backward control PUCCH SCell information such as the HARQ feedback,the Channel Status Information (CSI), Sounding Reference Signal (SRS),or the Scheduling Request (SR) is transmitted through the PUCCH.Hereinafter, the SCell through which the PUCCH is transmitted isreferred to as a PUCCH SCell. Identifier information of the PUCCH SCell,PUCCH configuration information, and the like is a lower layerinformation of this information. Data forwarding The data forwardinginformation is logical information channel (or logical tunnel)information to be used in a data exchange between the MeNB and the SeNB,and includes information such as a GPRS Tunnel Protocol (GTP) tunnelidentifier for a forward data exchange and a GTP tunnel identifier for abackward data exchange. Identifier of The identifier of UE is a C-RNTIto be used in UE the SCell of the SSCG by the UE. Hereinafter, it isreferred to as a C-RNTI_S. Bearer The bearer configuration informationis configuration configuration information of a bearer which isinformation offloaded. The bearer configuration information isconfiguration information includes a list of a bearer of which anoffload is accepted and configuration information according to eachbearer. When the configuration of the bearer is the same, the bearerconfiguration information may include only the list information of theaccepted bearer. Load The load information is information on ainformation current load situation of an added SCell, that is theserving cell_s. For example, the load information may be a % indicatinga level of a load of a corresponding cell during a predetermined currentpast period, and may be information such as high/medium/low.

When the MeNB 815 receives the control message, the MeNB 815 may comparea current frequency band combination configuration (i.e., a combinationof a frequency band of the serving cell_m and a frequency band of theserving cell_s) of the UE with a performance for a correspondingfrequency band combination reported by the UE, and may determine whetheran application of a pattern is necessary.

As a result of the determination, when it is necessary to apply thepattern, the MeNB 815 compares load information of the serving cell_sprovided from the SeNB with a load of the serving cell_m configured tothe UE to determine the pattern to be applied. For example, when theload of the serving cell_s is preferable to the load of the servingcell_m, the SSCG subframe selects more patterns compared to the MSCGsubframe.

The MeNB transfers the determined pattern information to the SeNB usinga predetermined control message. The pattern information may include thebitmap 1, bitmap 2 and offset, or the pattern index and offset.

The MeNB 815 generates the RRC control message indicating the servingcell addition and transmits the RRC control message to the UE 805 (835).The RRC control message includes pattern information and thus the RRCcontrol message includes at least some pieces of information among thefollowing pieces of information shown in Table 7.

TABLE 7 Name Description SCellAddMod Information transmitted by the SeNBis stored as itself. That is, the SCellAddMod is information the same asthe SCellAddMod of Table 6. One SCellAddMod is stored per one SCell, andthe information is a lower layer information of the SCellAddModList.PUCCH Information transmitted by the SeNB is configuration stored asitself. That is, the PUCCH information for configuration information forPUCCH SCell is PUCCH SCell information the same as the PUCCH informationfor PUCCH SCell of Table 6. Serving cell_s The serving cell_sinformation is information information on the SCells that belongs to theSSCG among the configured SCells. The serving cell_s information may beidentifiers of the SCells or identifiers of the TAGs that belong to theSSCG. Identifier of The identifier of UE is C-RNTI to be used in UE theserving cell of the SSCG by the UE. That is, the identifier of UE is aC-RNTI_S. Offload bearer The offload bearer information is informationinformation on a bearer to be processed in the SeNB. The offload bearerinformation is information on a bearer transmitted and received throughthe serving cell_s from a point of the UE. When a list of the bearer anda bearer configuration are different, the bearer configurationinformation is included here. Pattern Bitmap 1, Bitmap 2, Offset, andthe like information

The configuration information of a plurality of SCells may be stored inthe RRC control message. In addition, the serving cell_m and the servingcell_s may be configured together. For example, a Cell b, a Cell c, aCell d and a Cell e are configured to a UE of which a Cell a is a PCellas the SCell, and the pieces of the information may be disposed invarious sequences in the RRC control message.

FIG. 9 is a view illustrating a configuration of the RRC control messageaccording to an embodiment of the present specification.

In the present embodiment, it is assumed that the Cell a and Cell b havethe same backward transmission timing and form a P-TAG, the Cell c formsan S-TAG 1, and the Cell d and Cell e form an S-TAG 2.

The RRC control message includes SCellToAddModList 905 and patterninformation 940. In the SCellToAddModList 905, SCellToAddMod 910 for theCell b, SCellToAddMod 915 for the Cell c, SCellToAddMod 920 for the Celld, SCellToAddMod 925 for the Cell e are stored. Specific information maybe included or not included in the SCellToAddMod 910, 915, 920 and 925according to a nature of a corresponding SCell. When the SCell isincluded in the P-TAG, that is, the SCell has the backward transmissiontiming the same as that of the PCell, information on the TAG is notstored in a corresponding SCellToAddMod. For example, the information onthe TAG is not stored in the SCellToAddMod 910 for the Cell b. In theremained SCellToAddMod 915, 920 and 925 for the SCells in the TAG ratherthan the P-TAG, an identifier and a TA timer value of the TAG in which acorresponding SCell is included are included.

In at least one cell among the serving cell_s, information 930 on theSSCG, for example, an identifier of the SSCG and a C-RNTI of a UE to beused in the SSCG are stored. In an example of FIG. 9, the information isstored in the SCellToAddMod 915 for the Cell d. The PUCCH configurationinformation 935 is stored in at least one cell among the serving cell_s.In the example of FIG. 9, the information is stored in the SCellToAddMod915 for the Cell d. Information on the SSCG of the SCell having the sameTAG id is applied to the SCell included in the SSCG but does not havethe information on the SSCG. For example, since the SSCG relatedinformation is not stored in the Cell e, but the SSCG relatedinformation is stored in the Cell d having the same TAG id, the UEdetermines that the Cell e is also the SSCG, and the SSCG identifier andthe C-RNTI of the Cell e use the same value indicated for the Cell d.FIG. 10 is a view illustrating a configuration of the RRC controlmessage according to another embodiment of the present specification.

FIG. 10 illustrates another example in which the TAG related informationand the SSCG related information are stored in an additional positionrather than the SCellToAddMod.

The RRC control message includes SCellToAddModList _1005. In theSCellToAddModList _1005, SCellToAddMod _1010 for a Cell 2, SCellToAddModfor a Cell 3, SCellToAddMod for a Cell 4 and SCellToAddMod for a Cell 5are stored. In the SCellToAddMod, pieces of information of the sametypes are stored. That is, in all SCellToAddMods, information such assCellIndex-r10, cellIdentification-r10 andradioResourceConfigCommonSCell-r10 are stored.

The TAG related information _1015, the SSCG related information _1020,the PUCCH configuration information of the PUCCH Scell, the patterninformation _1050, and the like are stored individually. In the TAGrelated information 1015, the TAG identifier, identifiers of the SCellsforming the TAG and the TA timer value according to each TAG are stored.For example, information _1030 wherein a TAG of which the TAG identifieris 1 is formed of the SCell 2 and t1 is used as the TA timer is stored,and information _1035 wherein a TAG of which the TAG identifier is 2 isformed of the SCell 3 and the SCell 4 and t2 is used as the TA timer isstored.

In the SSCG related information _1020, a cell group identifier,identifiers of the serving cells forming the cell group and the C-RNTIinformation to be used in a corresponding cell group according to eachSSCG are stored. For example, information _1040 wherein an SSCG of whichthe cell group identifier is 1 is formed of the SCell 3 and the SCell 4and x is used as the C-RNTI is stored. Information on the MSCG is notsignalized separately and is determined according to the following rule.

<MSCG Related Information Determining Rule>

The serving cell in the MSCG: the SCell and PCell not the serving cell_samong the SCells

The C-RNTI to be used in the MSCG: the C-RNTI which is currently beingused in the PCell

In the SSCG related information, the identifier of the TAG rather thanthe identifier of the SCell may be included. This is an available methodunder a premise in which one TAG is not formed through the multiple cellgroups. For example, in the SSCG configuration information _1020,information indicating a TAG id 2 instead of information indicating theSCell 3 and the SCell 4 may be stored, and the UE may determine that theSCell 3 and the SCell 4 in the TAG id 2 are the SSCG.

The PUCCH configuration information of the PUCCH SCell includes the SSCGidentifier, the identifier of the PUCCH SCell and the PUCCHconfiguration information. One PUCCH SCell exists per SSCG. The CSIinformation, the HARQ feedback information and the like for the servingcells in the SSCG are transmitted through the PUCCH configured in thePUCCH SCell.

The PUCCH SCell may be determined according to a predetermined ruleinstead the identifier of the PUCCH SCell is definitely signalized. Forexample, an SCell corresponding to a first SCellToAddMod of theSCellToAddModList may be determined as the PUCCH SCell. Alternatively,an SCell of which the SCell identifier is the highest or an SCell ofwhich the SCell identifier is the lowest among the SCells of whichSCellToAddMod information is stored in a corresponding RRC controlmessage may be determined as the PUCCH SCell. Such a tacit determiningmethod is performed in a premise in which one SSCG exists.

Random access configuration information of multiple serving cells may beincluded. The UE should perform a random access in at least one servingcell among the serving cells in the TAG. In order to perform the randomaccess in a random serving cell, the random access configurationinformation of a corresponding serving cell is necessary. The UE inwhich multiple serving cells are configured has the following randomaccess configuration information.

Random access configuration information of the PCell: The random accessconfiguration information of the PCell is information obtained throughsystem information SIB 2 of the PCell by the UE, and is applied when theUE perform the random access in the PCell.

Random access configuration information of a predetermined SCell: Therandom access configuration information of the predetermined SCell isinformation applied when the UE performs the random access in the SCell,and is stored in radioResourceConfigCommonSCell-r10 andradioResourceConfigDedicatedSCell-r10 of a corresponding SCell. That is,the random access configuration information of the predetermined SCellis transferred to the UE through an exclusive RRC control message.

The random access configuration information includesprach-ConfigIndex-r10 which is information on a Physical Random AccessChannel (PRACH) resource configured in a corresponding serving cell. Therandom access process includes transmitting a preamble from the UE,transmitting an RAR from the eNB to the UE, and the like. Theprach-ConfigIndex-r10 is information specifying the PRACH resource inwhich the UE transmits the preamble. Since the PRACH is alwaysconfigured in specific frequency resource in the FDD, the informationspecifies a subframe in which the PRACH is configured. Since the PRACHis configured in one among six frequency resources in the TDD, theinformation specifies both of the subframe and the frequency resource.The prach-ConfigIndex-r10 is an integer between 0 and 63, and the PRACHspecified by each index is described in section 5.7 of standard 36.211.

Referring to FIG. 8 again, in step 840, the UE 805 transmits a responsemessage (e.g., RRC connectivity reconfiguration completion message) tothe serving eNB 815, and in step 845, the UE 805 establishes forwardsynchronization with newly configured SCells.

Next, in step 850, the UE 805 obtains a System Frame Number (SFN) of thePUCCH SCell among newly configured SCells. The SFN obtainment isperformed in a process of receiving system information called a MasterInformation Block (MIB). The SFN is an integer between 0 and 1023, andis increased by 1 every 10 ms. The UE 805 identifies a PUCCHtransmission time of the PUCCH SCell using the SFN and PUCCHconfiguration information.

Next, the UE 805 waits until the SCells are activated. When the SeNB 810receives forward data from the serving eNB 815 or receives apredetermined control message indicating an activation of the SCell, theSeNB 810 starts a procedure of activating the SCells (855).

In step 860, the SeNB 810 may transmit a control message (e.g., A/D MACCE) indicating an activation, for example, the SCell 3 to the UE 805.

When the UE 805 receives the MAC CE in a subframe n, the UE activatesthe SCell in a subframe (n+m1).

However, since backward synchronization of the PUCCH SCell is notestablished yet in the subframe (n+m1), although the SCell is activated,all of the forward and backward transmitting and receiving areimpossible. That is, the UE 805 monitors the PDCCH of the SCell, but theUE 805 ignores forward/backward resource allocation signal although theUE 805 receives the forward/backward resource allocation signal.

The SeNB 810 transmits the random access command to the UE 805 such thatthe UE 805 establishes the backward synchronization of the PUCCH SCell(865). The UE 805 starts the random access process in the PUCCH SCellusing an exclusive preamble indicated in the command. That is, the UE805 transmits the preamble in the SCell (870), and monitors PDCCH inorder to receive the RAR which is a response message for this.

When the UE 805 transmits the preamble in the MSCG, the RAR istransmitted through the PCell. In contrast, when the UE 805 transmitsthe preamble in the serving cell_s, the UE 805 monitors the PDCCH of theSCell transmitting the preamble or the PUCCH SCell in order to receivethe RAR. This is because an additional information exchange is necessarybetween the SeNB 810 and the serving eNB 815.

For example, the RAR may be received through a C-RNTI_s of the UE 805.This is because transmitting and receiving the response message usingthe C-RNTI_s is more effective, since there is no probability of anoccurrence of an incorrect operation by a conflict because the C-RNTI_sis allocated to the UE 805 in advance and an exclusive preamble is used(when the eNB receives an exclusive preamble, the eNB recognizes the UEtransmitting the preamble. Thus, the eNB recognizes the UE to which theeNB transmits the RAR). When the UE 805 receives an effective responsemessage in the SCell or PDCCH SCell in which the preamble istransmitted, the UE 805 adjusts a backward transmission timing of thePDCCH SCell or a TAG in which the SCell is included by applying a TAcommand of the response message and activates the backward direction ata predetermined time. The predetermined time may be a subframe (n+m2)when an effective TA command or an effective random access responsemessage is received at a subframe (n). The m2 is previously determinedinteger.

Meanwhile, according to an embodiment of the present invention, the UEdoes not depend on a dynamic scheduling in the serving cell_s, and mayperform the backward transmission using a predetermined transmissionresource or according to a determination thereof. For example, the CQIand the like may be transmitted through transmission resources allocatedin the PUCCH in advance. Alternatively, the UE selects some amongtransmission resources noticed as a preamble transmission purpose toperform the preamble transmission. The Sounding Reference Signal (SRS)is also performed by the backward transmission through a previouslyallocated transmission resource.

In a circumstance in which a pattern is used so as not to overlap thebackward transmissions of the serving cell_m and the serving cell_s, thebackward transmission which is autonomously performed by the UE asdescribed above should also be adjusted suitably for the pattern. Thatis, the PUCCH transmission resource configured in the serving cell_s ofthe UE should be configured on the SSCG subframe, and the PRACH preambletransmitted on the random access process should be transmitted on theMSCG subframe.

To this end, a method of defining the PRACH configuration informationmay be considered so as to configure the PRACH such that the PRACHadapts a specific pattern or so as to allocate PUCCH transmissionresource such that the PUCCH adapts a specific pattern by defining thePUCCH configuration information flexibly. Such a method has a limit inwhich previously defined PUCCH configuration information or PRACHconfiguration information cannot be used and PRACH configurationinformation applied all UEs of the cell cannot be used since a patternis different according to each UE.

Therefore, the UE according to an embodiment of the present inventionmay define a pattern applied to the backward transmission based on thesubframe specified by the configuration information and the subframespecified by the pattern while using the existing configurationinformation as itself. For example, the UE may define an intersection ofthe subframe specified by the configuration information and the subframespecified by the pattern as the pattern applied to the autonomousbackward transmission.

For example, when a subframe pattern of a random UE A is the same as_1105 and a subframe in which a Channel Quality Indicator (CQI)transmission resource specified by cqi-PUCCH-ResourceIndex of the PCellis configured is the same as _1110, in determining a subframetransmitting the CQI in the PCell by the UE, the UE determines that onlysubframes _1115 which are the MSCG subframe of the subframe pattern anda CQI transmission subframe of the PCell as a subframe transmitting theCQI.

In determining the subframe transmitting the CQI in the PUCCH SCell, theUE masks a subframe in which the CQI transmission resource specified bycqi-PUCCH-ResourceIndex of the PUCCH SCell is configured as the SSCGsubframe, and the UE transmits the CQI in the PUCCH SCell with respectto only a subframe corresponding to both of them.

The operation may also correspond to another PUCCH transmissionresource, for example, Precoding Matrix Indicator (PMI), Precoding TypeIndicator (PTI), Rank Indicator (RI), Scheduling Request (SR)transmission resources, SRS transmission resources and the like.

The transmission resources are specified by cqi-pmi-ConfigIndex,ri-ConfigIndex, sr-ConfigIndex and srs-ConfigIndex. In determining thesubframe transmitting the backward signal in the PCell by the UE, the UEmasks subframes specified by cqi-pmi-ConfigIndex, ri-ConfigIndex,sr-ConfigIndex and srs-ConfigIndex of the PCell, respectively, as theMSCG subframe to determine the PCell subframe transmitting the backwardsignal.

In addition, in determining the subframe transmitting the backwardsignal in the PUCCH SCell by the UE, the UE may mask subframes specifiedby cqi-pmi-ConfigIndex, ri-ConfigIndex, sr-ConfigIndex andsrs-ConfigIndex of the PUCCH SCell, respectively, as the SSCG subframeto determine the PUCCH SCell subframe transmitting the backward signal.

In addition, in determining the subframe transmitting the SRS in arandom SCell by the UE, the UE masks subframes specified bysrs-ConfigIndex of a corresponding SCell, respectively, as the MSCGsubframe when the SCell is the serving cell_m and as the SSCG subframewhen the SCell is the serving cell_s to determine the subframetransmitting the SRS.

FIG. 12 is a flowchart illustrating a UE operation sequence transmittingthe CQI according to an embodiment of the present invention.

In step _1205, the UE receives cqi-PUCCH-ResourceIndex of the PCell,cqi-PUCCH-ResourceIndex of the PUCCH SCell, pattern information and thelike from the eNB. The pieces of the information may be receivedsimultaneously through one control message, and may be receivedsequentially through individual control messages.

In step _1210, the UE determines the subframe transmitting the PUCCH CQIof the PCell, the subframe transmitting the PUCCH CQI of the PUCCHSCell, and the subframe pattern using the pieces of the information. Thetransmitting of the PUCCH CQI means transmitting the CQI using the PUCCHtransmission resource. The determining operation may be simultaneouslyprogressed, or may be sequentially progressed according to a receivedsequence of related control information.

Next, the UE performs a normal operation. In step _1215, when thesubframe transmitting the PUCCH CQI, for example a subframe n, isapproached, the UE performs step _1220.

In step _1220, the UE determines a type of the subframe n. When thesubframe n is the MSCG subframe, the UE performs step _1225, when thesubframe n is the switching subframe, the UE performs step _1230, andwhen the subframe is the SSCG subframe, the UE performs step _1235.

In _1225 step, the UE checks whether the PUCCH CQI transmissionscheduled in the subframe n is the PUCCH CQI transmission of the PCell.That is, the UE checks whether the subframe n is a subframe specified bycqi-PUCCH-ResourceIndex of the PCell. When the PUCCH CQI transmissionscheduled in the subframe n is the CQI transmission of the PCell, the UEperforms step _1240, and when the PUCCH CQI transmission scheduled inthe subframe n is not the CQI transmission of the PCell, the UE performsstep _1230.

In step _1230, the UE does not perform the PUCCH CQI transmissionscheduled in the subframe n and waits until a next subframe to which thePUCCH CQI transmission is configured comes.

In step _1235, the UE checks whether the PUCCH CQI transmissionscheduled in the subframe n is the PUCCH CQI transmission of the PUCCHSCell. That is, the UE checks whether the subframe n is a subframespecified by cqi-PUCCH-ResourceIndex of the PUCCH SCell.

When the PUCCH CQI transmission scheduled in the subframe n is the CQItransmission of the PUCCH SCell, the UE performs step _1245, and whenthe PUCCH CQI transmission scheduled in the subframe n is not the CQItransmission of the PUCCH SCell, the UE performs step _1230.

In step _1240, when the UE determines at a subframe [n-5], the UEdetermines whether the subframe n is an active time. Step _1240 isperformed only in the case in which a DRX is configured. A terminal towhich the DRX is not configured skips step _1240 and directly performsstep _1250.

In this case, the DRX is a method for reducing a battery consumption ofthe UE, and the UE may monitor the PDCCH only during an active timespecified by a predetermined condition.

Regarding the CQI transmission, in principle, it is preferable totransmit the CQI only during the active time. However, since the activetime may be expired or ended unexpectedly, it may not be possible tocomply with the principle.

In determining whether the UE transmits the CQI in a random subframe,when the UE determines before a predetermined period, if the subframe isthe active time, the UE transmits the CQI, and if the subframe is notthe active time, the UE does not transmit the CQI. More specifically, indetermining whether the UE transmits the CQI in the subframe n, when theUE considers a forward assignment, a backward grant, the DRX command andthe like received until a subframe [n-5], the UE determines that the UEtransmits the CQI according to whether the subframe n is the activetime.

When a situation by the subframe [n-5] is considered, if n is the activetime, the UE performs step _1250, and if n is not the active time, theUE performs step _1230.

In step _1250, the UE performs the PUCCH CQI transmission in the PCell.In addition, the UE waits until a next subframe to which the PUCCH CQItransmission is configured comes.

In step _1245, the UE considers the situation by the subframe [n-5], ifn is the active time, the UE performs step _1255, and if n is not theactive time, the UE performs step _1230.

In step _1255, the UE performs the PUCCH CQI transmission in the PUCCHSCell. In addition, the UE waits until a next subframe to which thePUCCH CQI transmission is configured comes.

FIG. 13 is a flowchart illustrating an operation sequence of the UEtransmitting the SRS according to an embodiment of the presentinvention.

In step _1305, the UE receives at least one srs-ConfigIndex, patterninformation and the like from the eNB. The srs-ConfigIndex may besignalized according to each serving cell. The pieces of the informationmay be received simultaneously through one control message, and may bereceived sequentially through individual control messages.

In step _1310, the UE determines a subframe transmitting the SRSaccording to each serving cell and the subframe pattern using the piecesof the information. The determining operation may be simultaneouslyprogressed, or may be sequentially progressed according to a receivedsequence of control information.

Next, the UE performs a normal operation. In step _1315, when thesubframe transmitting the SRS, for example a subframe n, is approached,the UE performs step _1320.

In step _1320, the UE determines a type of the subframe n. When thesubframe n is the MSCG subframe, the UE performs step _1325, when thesubframe n is the switching subframe, the UE performs step _1330, andwhen the subframe is the SSCG subframe, the UE performs step _1335.

In _1325 step, the UE checks whether the SRS transmission scheduled inthe subframe n is configured to serving cell_m. That is, the UE checkswhether the subframe n is a subframe specified by srs-ConfigIndex of theserving cell_m. When the SRS transmission, scheduled in the subframe nis the SRS transmission of the serving cell_m, the UE performs step_1340, and when the SRS transmission scheduled in the subframe n is theSRS transmission of the serving cell_s, the UE performs step _1330.

In step _1330, the UE does not perform the SRS transmission scheduled inthe subframe n and waits until a next subframe to which the SRStransmission is configured comes.

In _1335 step, the UE checks whether the SRS transmission scheduled inthe subframe n is the SRS transmission of the serving cell_s. That is,the UE checks whether the subframe n is a subframe specified bysrs-ConfigIndex of the serving cell_s. When the SRS transmissionscheduled in the subframe n is the SRS transmission of the servingcell_s, the UE performs step _1345, and when the SRS transmissionscheduled in the subframe n is not the SRS transmission of the servingcell_s, the UE performs step _1330.

In step _1340, when the UE considers a situation by a subframe [n-5], ifn is an active time, the UE performs step _1350, and if n is not theactive time, the UE performs step _1330.

In step _1350, the UE performs the SRS transmission in the servingcell_m. In addition, the UE waits until a next subframe to which the SRStransmission is configured comes.

In step _1345, when the UE considers the situation by the subframe[n-5], if n is the active time, the UE performs step _1355, and if n isnot the active time, the UE performs step _1330.

In step _1355, the UE performs the SRS transmission in the servingcell_s. In addition, the UE waits until a next subframe to which the SRStransmission is configured comes.

FIG. 14 is a flowchart illustrating an operation sequence of the UEtransmitting the Scheduling Request (SR) according to an embodiment ofthe present invention.

In step _1405, a Buffer Status Report (BSR) is triggered to the UE. TheBSR is control information reporting a buffer status to the eNB, and oneof two formats called a short BSR and a long BSR is selectively used. Inthe BSR, a Buffer Status (BS) for one to four Logical Channel Group(LCG) is reported.

The short BSR is used when an LCG in which transmitted data is includedis one, and includes an LCG identifier and the BS. In the long BSR, theBS of four LCGs is reported, and the BSs of the LCG are stored in asequence of an LCD identifier.

The LCG is a group of grouped logical channels by the control of theeNB, and the logical channels generally have a similar logical channelpriority. The BS of the LCG is a sum of the BS related to the logicalchannels in the LCG, and indicates an amount of transmittable data amongdata of an RLC transmission buffer, an RLC retransmission buffer, a PDCPtransmission buffer of the logical channels. The BSR is periodicallytriggered, or is triggered when a predetermined condition, for example,data of which priority is higher than that of currently stored data isgenerated. The former is referred to as a periodic BSR and the latter isreferred to as a formal BSR.

In _1407 step, the UE checks whether the triggered BSR is the periodicBSR or the formal BSR. When the triggered BSR is the formal BSR, the UEperforms step _1410, and when the triggered BSR is the periodic BSR, theUE performs step _1409.

In step _1409, the UE waits until transmission resources capable oftransmitting the BSR are allocated.

Meanwhile, when the formal BSR is triggered, in step _1410, the UEstarts a procedure for requesting a transmission resource allocationtransmitting the BSR. This is because the formal BSR differently fromthe periodic BSR should be transmitted rapidly to the eNB.

In step _1410, the UE checks whether the data triggering the formal BSR,or data of which priority is the highest among transmittable data at acorresponding time is data included in an LCG_m or data included in anLCG_s. Alternatively, the UE checks whether the data triggering theformal BSR is data included in an LCH_m or data included in an LCH_s.When an LCH transmitted/received in the serving cell_s is referred to asan LCH_s and an LCH transmitted/received in the serving cell _m isreferred to as an LCH_m, the LCG_m is a logical channel group formed ofonly the LCH_m and the LCG_s is a logical channel group formed of onlythe LCH_s. When the data triggering the formal BSR is in the LCH_m, step_1415 is performed, and when the data triggering the formal BSR is inthe LCH_s, step _1430 is performed. Alternatively, when the datatriggering the formal BSR is in the LCG_m, step _1415 is performed, andwhen the data triggering the formal BSR is in the LCG_s, step _1430 isperformed.

In step _1415, the UE checks whether the SR is configured in the PUCCHtransmission resource of the PCell. Alternatively, the UE checks whethersr-ConfigIndex is signalized for the PCell and sr-ConfigIndex is notreleased yet. When the SR is configured, step _1420 performed, and whenthe SR is not configured, step _1427 is performed.

In step _1420, the UE masks subframes specified by sr-ConfigIndex of thePCell as the MSCG subframe to determine subframes transmittable SR. Instep 1425, the UE selects one among the identified subframes to transmitthe SR. For example, the UE may select a subframe which is the closet toa corresponding time.

In step _1427, the UE triggers the random access in the PCell.

In addition, in step _1430, the UE checks whether the SR is configuredin the PUCCH transmission resource of the PUCCH SCell. Alternatively,the UE checks whether sr-ConfigIndex is signalized for the PUCCH SCelland sr-ConfigIndex is not released yet. When the SR is configured, step_1435 performed, and when the SR is not configured, step _1445 isperformed.

In step _1435, the UE masks subframes specified by sr-ConfigIndex of thePUCCH SCell as the SSCG subframe to determine subframes transmittableSR. In step 1440, the UE selects one among the identified subframes totransmit the SR. For example, the UE may select a subframe which is thecloset to a corresponding time. In step _1445, the UE triggers therandom access in the PUCCH SCell.

FIG. 15 is a flowchart illustrating an operation sequence of the UEperforming a random access process according to an embodiment of thepresent invention.

In step _1505, the random access is triggered to the UE. The randomaccess may be triggered in various reasons. For example, there are atriggered case in a target cell in the case of the handover, a triggeredcase by an indication of the eNB, a triggered case to transmit the BSR,and the like.

In step _1510, the UE checks whether the random access is triggered inthe PCell or the SCell. When the random access is triggered in thePCell, step _1520 is performed, and when the random access is triggeredin the SCell, the step _1515 is performed.

In step _1515, the UE checks whether the SCell in which the randomaccess is triggered is the serving cell _m or the serving cell_s. Whenthe SCell is the serving cell_m, step _1520 is performed, and when theSCell is the serving cell_s, step _1525 is performed.

In summary of step _1510 and step _1515, when the random access istriggered, if the random access is triggered in the PCell or the SCellof the MSCG, the UE performs step _1520, and if the random access istriggered in the SCell of the SSCG, the UE performs step _1525.

The case in which the random access is triggered in the PCell mayinclude, for example, a case wherein the random access is triggered bythe handover, a case wherein the eNB directs the random access in thePCell, a case wherein the formal BSR is triggered by the LCH_m data ofthe UE to which the PUCCH SR is not configured, a case wherein the RRCconnection reconfiguration process is triggered, a case wherein thePUCCH SR transmission of the PCell fails, and the like.

The case wherein the random access is triggered in the SCell of the MSCGmay include, for example, a case wherein the eNB directs the randomaccess in a corresponding SCell. The case wherein the random access istriggered in the SCell of the SSCG may include, for example, a casewherein the eNB directs the random access in a corresponding SCell, acase wherein the formal BSR is triggered by the LCH_s data, and thelike.

In step _1520, the UE masks a subframe specified by prach-ConfigIndex ofa corresponding serving cell, that is the PCell or the SCell of the MSCGas the MSCG subframe. That is, the UE determines that subframes whichare subframes specified by prach-ConfigIndex and the MSCG subframes asthe transmittable subframe. As described above, prach-ConfigIndex of thePCell is obtained through an SIB2 of the PCell, and prach-ConfigIndex ofthe SCell of the MSCG is obtained through a predetermined exclusive RRCcontrol message.

In step _1525, the UE masks a subframe specified by prach-ConfigIndex ofa corresponding serving cell, that is the SCell of the SSCG as the SSCGsubframe. That is, the UE determines that subframes which are subframesspecified by prach-ConfigIndex and the SSCG subframes as thetransmittable subframe. The prach-ConfigIndex of the SCell of the SSCGis obtained through a predetermined exclusive RRC control message.

In step _1530, the UE selects one among subframes in which the preambletransmission is possible and transmits the preamble. For example, the UEmay select the closest subframe among the subframes. The UE transmitsthe preamble until the UE receives an effective random response messageaccording to a predetermined rule.

In step _1535, the UE receives a random access response message. In therandom access response message, uplink transmission resource allocationinformation (e.g., an uplink grant and an UL grant), transmission outputcontrol command information (e.g., a Transmission Power Control (TPC)),uplink transmission time adjustment information (e.g., Timing Advance(TA)), and the like are stored. When the UE receives an effective randomaccess response message, the UE adjusts a transmission power accordingto the transmission output control command, and adjusts the backwardtransmission timing according to the TA.

In step _1540, the UE determines whether the random access is aContention Free Random Access (CFRA) or a contention random access.

Here, the CFRA means a random access in which a preamble (e.g., anexclusive preamble and a dedicated preamble) directed by the eNB isused. When the eNB receives the preamble, the eNB identifies the UEtransmitting the preamble.

In contrast, the contention random access means a random access in whicha preamble (e.g., a random preamble) selected by the UE is used. The eNBcannot identify the UE transmitting the preamble using only thereception of the preamble, and Msg 3 transmission/reception through acontention solution process is necessary. When the random access is acontention free based random access, in allocating the UL grant in therandom access response message by the eNB, the eNB allocates the ULgrant such that the UL grant corresponds to the subframe pattern. Thatis, the random access is the CFRA in the PCell or the CFRA in the SCellof the MSCG, the UL grant is allocated such that the PUSCH transmissiontriggered by the UL grant is performed in the MSCG subframe.

When the random access is the CFRA in the SCell of the SSCG, the ULgrant is allocated such that the PUSCH transmission triggered by the ULgrant is performed in the SSCG subframe. Therefore, in step _1545, theUE performs the PUSCH transmission for the UL grant according to thesubframe pattern. When the random access is the contention based randomaccess, the UE performs step _1550.

The UE ignores the subframe pattern during a predetermined time, forexample, until the PUSCH transmission triggered by the UL grant of therandom access response message is completed. After the predeterminedtime is elapsed, the UE restarts a subframe pattern application. Inaddition, when the backward transmissions of the SSCG and the MSCG areconflicted while the UE ignores the subframe pattern, the UE performsthe PUSCH transmission triggered by the UL grant of the RAR, and givesup another backward transmission.

For example, when the UE performs the contention random access in thePCell, the UE performs the PUSCH transmission in the subframe althoughthe PUSCH transmission triggered by the UL grant of the random accessresponse message should be performed in the SSCG subframe or theswitching subframe. In addition, when the PUSCH transmission isconflicted with the backward transmission of the SSCG, the UE performsthe PUSCH transmission and gives up another backward transmission of theSSCG.

FIG. 16 is a flowchart illustrating an operation sequence of the UE andthe eNB, in which the UE reports a UE capability to the eNB and the eNBconfigures an inter-eNB CA, according to an embodiment of the presentinvention.

First, the UE configures an RRC connection with the MeNB in a mobilecommunication system including the UE _1605, the SeNB _1610 and the MeNB_1615 (_1616).

After the RRC connection process is completed, the MeNB transmits acontrol message called a UE capability inquiry to the UE so as to obtaincapability information of the UE (_1617). The message directs the reportof the capability to the UE, may request capability information for aspecific Radio Access Technology (RAT) of the UE using a parameterreferred to as an RAT type.

When the UE performs the process in the LTE network, the RAT-type isconfigured as an Evolved Universal Terrestrial Radio Access (EUTRA). Ifthere is another wireless network, for example, UMTS network on theperiphery, the eNB may add the UTRA to the RAT-type to request UMTSrelated capability information of the UE, in order to prepare a laterhandover and the like.

When the UE receives the UE capability inquiry control message, the UEgenerates the UE capability information storing capability informationof the UE for a wireless technology directed in the RAT type to transmitthe UE capability information to the eNB (_1619). According to anembodiment of the present invention, in the control message, at leastone piece of band combination information may be stored according toeach band combination supported by the UE. The band combinationinformation is information indicating a CA combination supported by theUE. The eNB may configure a proper CA to the UE using the information.

As described above, in the capability information of the UE, information(i.e., SupportedBandCombination (SBC)_1705) on a band combinationsupported by the UE is included. The SBC includes at least one bandcombination parameter (i.e., BandCombinationParameters (BCP)_1710,_1715, _1720 and _1725). The BCP is information on each band combinationsupported by the UE.

The BCP includes at least one band parameter (i.e., BandParameters(BP)).

The BP includes information (i.e., FreqBandIndicator) indicating a band,a forward band parameter (i.e., BandParametersDL (BPDL) and a backwardband parameter (i.e., BandParametersUL (BPUL).

The BPDL and the BPUL again includes a bandwidth layer class indicatingthe number of the serving cells supported in a corresponding band, andantenna capability information. The bandwidth class A indicates acapability capable of configuring one serving cell of which a wholebandwidth is a maximum of 20 MHz. The bandwidth class B indicates acapability capable of configuring two serving cells and a sum of a wholebandwidth is a maximum of 20 MHz. The bandwidth class C indicates acapability capable of configuring two serving cells and a sum of a wholebandwidth is a maximum of 40 MHz.

In order to support the inter-eNB CA, the UE should perform thefollowing functions.

-   -   A function of configuring and managing two or more serving cell        groups    -   A function of transmitting the PUCCH in at least one cell by        serving cell group    -   A function of transmitting/receiving data according to each        serving cell group

It may be different whether the multiple SCGs are supported or notaccording to each band combination. When the multiple SCGs aresupported, the number of the supported SCGs, and the like may bedifferent according to each band combination. In addition, it may bedifferent whether a TDM pattern is necessary, whether the switchingsubframe is necessary, and the like. When it is considered that thereare multiple band combinations in one UE, it is inefficient to reportall pieces of information of the UEs for all band combinations.

In an embodiment of the present invention, in reporting the capabilityof the inter-eNB CA by the UE, first, it may be indicated whether the UEsupports the inter-eNB CA, only in the case in which the UE supports theinter-eNB CA, the UE may report a detailed capability according to eachband combination.

The UE shows the following information using 1 bit or information _1735coded in another method of ASN.1.

-   -   The inter-eNB CA is supported or not in at least one band        combination among the band combinations supported by the UE;    -   Two or more serving cell groups are supported or not in at least        one band combination among the band combinations supported by        the UE;    -   The PUCCH may be transmitted or not in two or more serving cells        in at least one band combination among the band combinations        supported by the UE.

Hereinafter, for the convenience of description, ‘supporting theinter-eNB CA’, ‘supporting two or more serving cell groups’ and‘transmitting the PUCCH in two or more serving cells’ may have a similarmeaning and may be mixed.

When multipleSCGcapability _1735 is yes, or when the UE supports theinter-eNB CA, one 1 bit information (i.e., multipleSCGsupported)_1740 to_1760 is included in each band combination or each BCP. The 1 bitinformation may indicate yes or no, and may indicate whether acorresponding multipleSCGsupport exists. The multipleSCGsupported isinformation indicating whether the inter-eNB CA is supported or at leasttwo serving cell group are supported in a corresponding bandcombination, and the like. Specifically, the multipleSCGsupported havethe following meaning.

-   -   When the corresponding band combination includes one band        parameter (that is, includes one band entry), and two or more        serving cells are included backwardly for the band combination        (i.e., when a backward bandwidth class is not A, or when the        backward bandwidth class is B, C or more), if the        multipleSCGsupported is yes, the multipleSCGsupported means that        inter-eNB CA is supported for the serving cell of the        corresponding band entry. That is, the multipleSCGsupported        means that the serving cells may include two or more serving        cell groups in the band, and the PUCCH may be configured in the        serving cells (or means that the serving cells may be the PCell        or the PUCCH SCell). In FIG. 17, a band combination of which the        band entry is one includes _1710, _1715 and _1720. _1710 is a        non-CA to which all of the forward serving cell and the backward        serving cell are configured one by one, and _1715 the forward CA        in which two serving cells are configured in forward direction.        Thus, _1715 and _1720 do not correspond, and only _1720        corresponds. That is, when the multipleSCGsupported _1750 is yes        or the multipleSCGsupported exists, two serving cells may be        configured in a band x, the serving cells may be configured as        individual serving cell groups, and the PUCCH may be configured        in all serving cells.    -   When the corresponding band combination includes one band        parameter (that is, includes one band entry), and only one        serving cell is included backwardly for the band combination,        (i.e., the backward bandwidth class is A), the UE unrelated to a        value indicated by the multipleSCGsupported does not support the        inter-eNB CA for the band combination. For example, in band        combinations _1710 and _1715, the inter-eNB CA is not supported        regardless of the value indicated by _1740 and _1745.    -   When the corresponding band combination includes two or more        band parameters, and a BPUL is included in two or more band        entries (that is, a backward direction is configured in two or        more band entries, or a backward direction may be configured in        two or more serving cells), if the multipleSCGsupported is yes,        the UE may support the inter-eNB CA for the band combination,        may configure component carriers (or serving cells) in the same        band as one serving cell group, may configure the PUCCH in one        component carrier among the component carriers, and may        configure at least one cell as the PCell or the PUCCH SCell        according to each band entry. _1730 corresponds to here. _1760        illustrates whether one serving cell group may be configured in        a band x, another serving cell group may be configured in a band        y, and the serving cells may be configured as the PCell or the        PUCCH SCell.    -   When the corresponding band combination includes two or more        band parameters (i.e., includes two or more band entries), and        the BPUL is included in only one band entry (i.e., a backward        direction is configured in only one band entry), the UE does not        support the inter-eNB CA for the band combination regardless of        the value indicated by the multipleSCGsupported. For example, in        the band combination _1725, the inter-eNB CA is not supported        regardless of the value indicated by _1755.

The UE reports pattern capability information for the band combinationsatisfying a predetermined condition together. The pattern capabilityinformation _1765 and _1770 includes the following three types of lowerinformation.

-   -   Uplink TDM necessity indication information    -   Downlink TDM necessity indication information    -   Switching subframe necessity indication information

All lower information may exist, some of the lower information mayexist, and the existed lower information is determined implicitly. Whenthe uplink TDM is not necessary, since the downlink TDM is not necessaryand the switching subframe is also not necessary, the downlink TDMnecessity indication information and the switching subframe necessityindication information are omitted. This is referred to as patterncapability information 1 (i.e., patternCapabilityinfo1).

When the uplink TDM is necessary, all of the downlink TDM necessityindication information and the switching subframe necessity indicationinformation are necessary. When the uplink TDM is necessary, the UEapplies two Tx devices (2Rx/2Tx B) for the corresponding bandcombination, or applies one Tx device. When the two Tx devices areapplied, since a time required in an RF reconfiguration is extremelyshort, the UE reports that the switching subframe is not necessary. Whenone Tx device is applied, since the time required in the RFreconfiguration is considerable, the UE reports that the switchingsubframe is necessary. When one Rx device is applied to thecorresponding SBC, the UE reports that the downlink TDM is necessary.Thus, when the UE reports that the uplink TDM is necessary, the downlinkTDM necessity indication information and the switching subframenecessity indication information should be reported together.Information including all of the uplink TDM necessity indicationinformation, the downlink TDM necessity indication information and theswitching subframe necessity indication information is referred to aspattern capability information 2 (i.e., patternCapabilityinfo2).

The UE reports patternCapabilityinfo1 or patternCapabilityinfo2 withrespect to the band combination satisfying the following condition.

-   -   A band combination in which the band entry is one and the        backward bandwidth class is B or more (i.e., a band combination        in which the backward bandwidth class is not A)    -   A band combination in which the number of the band entries (or        backwardly configured band entries) including the BPUL are two        or more

The band combination _1720 and the band combination _1730 correspond tohere, and patternCapabilityinfo _1765 and _1770 are stored,respectively. The UE may not store the patternCapabilityinfo in the bandcombination which does not satisfying the condition, or may storepatternCapabilityinfo1 (i.e., patternCapabilityinfo indicating that theuplink TDM is not necessary) in the band combination which does notsatisfying the condition.

The UE stores the information in a control message called UE capabilityinformation and transmits the information to the eNB. WhenmultipleSCGcapability _1735 is stored in the message,multipleSCGsupported information _1740 to _1760 are sequentially storedequally to the band combination for the all band combinations, andpatternCapabilityinfo _1765 and _1770 are stored for a band combinationsatisfying a predetermined condition. When the multipleSCGcapbility isnot stored, multipleSCGsupported and patternCapabilityinfo are also notstored.

Referring to FIG. 16 again, when the eNB receives the UE capabilityinformation storing the information, the eNB may determine whether theeNB configures the CA to the UE based on the capability information.When the eNB determines that the eNB configures the CA to the UE, theeNB may determine whether the eNB configures the inter-eNB CA, whetherthe eNB configures the CA in the eNB, and the like.

Step _1620, step _1625, step _1630, step _1633, step _1635 and step_1640 of FIG. 16 may correspond to step _820, step _825, step _830, step_833, step _835 and step _840 of FIG. 8.

In step _1645 and step _1650, the UE performs the backward transmissionfor the serving cells controlled by the MeNB in the MSCG subframe andperforms the backward transmission for the serving cells controlled bythe SeNB in the SSCG subframe.

As described above, when the UE operates an individual TX device in acorresponding band combination or in a corresponding CA configuration,and thus an extremely short switching time is required, the UE may use apattern having a small number of switching subframe pattern or a patternin which a switching subframe is not included. In this case, some of theMSCG subframe and some of the SSCG subframe may be overlapped. Forexample, when an eNB 1 is the MeNB and an eNB 2 is the SeNB, the MSCGsubframe _1805 and the SSCG subframe _1810 overlap. In this case, the UEperforms a puncturing of a last section of a subframe _1805 which isprior by a time of a predetermined duration, for example, one symbolduration _1815 (e.g., one OFDM symbol duration) to perform the backwardtransmission. The reason of the puncturing by one symbol duration isthat a format of a puncturing by one symbol duration among PUSCHtransmission formats is previously defined in a standard.

When the UE fails the random access, according to the prior art, the UEends the random access process and does not perform an additionaloperation. Generally, since an object of the random access is totransfer important information to the eNB, it is preferable tocontinuously perform the random access process before an RRC layerdefinitely directs an end of the random access process. However, whenthe random access has already failed, a preamble transmission output mayalready be considerably high because of a power lamping applied to thepreamble, and the continuous random preamble transmission may causeconsiderable uplink interference to a peripheral cell.

In the present invention, the random access failure is classified as afirst failure and a second failure. Although the random access failedfirst, the UE maintains the preamble transmission. At this time, theuplink interference is maintained in a proper level after the firstfailure of the random access, by adjusting a preamble transmissionfrequency before and after the first failure of the random access. Inthe present invention, the first failure of the random access isreferred to as the case in which the random access is not succeededalthough the UE transmits the random access preamble by a predeterminednumber. The second failure of the random access is referred to as thecase in which the random access cannot be succeeded until a higher layerdirects a stop of the random access.

FIG. 22 illustrates a UE operation.

In step _2205, a random access is triggered by a random reason. Therandom access may be triggered by various reasons, and may be triggeredin the PCell or the SCell.

In step _2210, the UE selects a random access resource. The randomaccess resource referred to as an access preamble, a PRACH resource towhich a preamble is transmitted, and a subframe to which the PRACHresource is configured. The eNB may specify the random access resourceto the UE. When the eNB allocates a preamble index which is not 0 and aPRACH mask, the UE selects a preamble (i.e., a dedicated preamble)specified the preamble index using the PRACH resource of the subframespecified by the PRACH mask. When the eNB does not allocate the preambleindex or a preamble index which is 0, the UE selects a preamble (i.e., arandom preamble) to be transmitted by oneself by applying apredetermined rule. The rule for selecting the preamble index, the PRACHmask index and the random preamble, and the like are disclosed in therule 36.321.

In step _2212, after the UE waits during a first delay and performs step_2213. The first delay is a delay related to a PRACH configuration of aserving cell in which the random access is performed, and is a maximumvalue rather than a fixed value. More specifically, the first delay isdefined as a distance on a time between a time when the random accesspreamble is selected and the closet subframe transmittable the randomaccess preamble. Different first delays may be applied to the PCell andthe SCell.

In step _2213, the UE transmits the preamble. In step _2215, the UEchecks whether an effective RAR is received. More specifically, the UEdetermines whether an RAR satisfying a predetermined condition isreceived in a predetermined serving cell during ra-Window. Morespecifically, when an RAR addressed as a predetermined RA-RNTI isreceived during the ra-Window and a preamble identifier specifying thepreamble transmitted by the UE is included in the RAR, the UE determinesthat the effective RAR is received and performs step _2220. When thecondition is not satisfied, the UE performs step _2240. Thepredetermined serving cell in which the UE attempts to receive the RARmay be different according to a type of the serving cell in which apreamble is transmitted. When the preamble is transmitted in the PCell,the predetermined serving cell is the PCell. When the preamble istransmitted in the SCell and the SCell is an SCell of a master servingcell group, the predetermined serving cell is the PCell. When thepreamble is transmitted in the SCell and the SCell is an SCell of aslave serving cell group, the serving cell is the SCell in which thepreamble is transmitted.

In step _2220, the UE checks whether the dedicated preamble istransmitted or the random preamble is transmitted. When the dedicatedpreamble is transmitted, in step _2225, the UE determines that therandom access process is completed and ends the process. In step _2230,the UE transmits a message 3 according to the UL grant in the RAR. Themessage 3 is uplink data transmitted from the UE to the eNB for acontention resolution, and information, for example C-RNTI MAC CE,capable of identifying the UE is included in the message 3. The UEdetermines the serving cell in which the message 3 is transmitted inconsideration of the serving cell in which the preamble is transmittedrather than the serving cell in which the RAR is received. For example,although the RAR is received in the PCell, when the preamble istransmitted in the SCell, the message 3 is also transmitted in theSCell.

In step _2235, the UE checks whether the contention is resolved. Theresolution of the contention means that the UE receives a downlinksignal satisfying a predetermined condition before a predetermined timecalled mac-ContentionResolutionTimer is expired. The downlink signal mayinclude, for example, a predetermined RRC control message, a UL grantaddressed as C-RNTI, or a DL assignment. The process of the contentionresolution is disclosed in the rule 36.321.

If the contention is resolved, in step _2225, the UE determines that therandom access process is successfully completed and ends the process.

If the contention resolution fails, the UE performs step _2240.

In step _2240, the UE checks whether PREAMBLE_TRANSMISSION_COUNTER isthe same as a value obtained by adding 1 to preambleTransMax. ThePREAMBLE_TRANSMISSION_COUNTER is a variable which is initialized as 0when the random access process is triggered and then is increased by 1whenever the preamble is transmitted. The process is for determiningwhether a random access problem generation is reported to a higher layerdevice. The preambleTransMax is a value signalized from the eNB to theUE. When the random access process is triggered in the PCell,preambleTransMax obtained through system information of the PCell isapplied. When the random access process is triggered in the SCell,preambleTransMax notified through the dedicated RRC control message fromthe eNB is applied. When the condition is not satisfied, the UE performsstep _2257. When the condition is satisfied, the UE performs _2250. Instep _2250, the UE checks whether the serving cell in which the preambleis transmitted is the PCell or the SCell. When the serving cell is thePCell, step _2255 is performed, and when the serving cell is the SCell,step _2257 is performed. In step _2255, the UE reports that the randomaccess problem is generated to the RRC layer device. The RRC layerdevice may reset an MAC layer device such that the UE may stop therandom access according to a situation.

In step _2257, the UE checks whether the PREAMBLE_TRANSMISSION_COUNTERis larger than the value obtained by adding 1 to the preambleTransMaxsuch that the UE determines whether a first failure is generated. Whenthe PREAMBLE_TRANSMISSION_COUNTER is larger than the value obtained byadding 1 to the preambleTransMax, the UE performs step _2260, and whenthe PREAMBLE_TRANSMISSION_COUNTER is not larger than the value obtainedby adding 1 to the preambleTransMax, the UE is returned to step _2210.After the UE waits during a second delay to adjust a preambletransmission period in step _2260, the UE selects the random accessresource in step _2210. The second delay is a value larger than that ofthe first delay, and may be differently configured according to a typeof the serving cell. In the PCell, since a probability in which moreimportant information is transmitted through the random access is high,a comparatively short value, for example about 100 ms may be applied tothe second delay. In contrast, in the SCell, since an important RRCcontrol message is not transmitted through the random access, a largervalue such as about several hundred ms may be used as the second delay.Alternatively, the second delay may be configured as an infinite valuein the SCell so as to stop the preamble transmission after a firstfailure of the random access in the SCell.

As described above, before a predetermined condition is satisfied, thatis, when the PREAMBLE_TRANSMISSION_COUNTER is equal to or lower than thevalue obtained by adding 1 to the preambleTransMax, the UE applies afirst period to the preamble transmission/retransmission. When thePREAMBLE_TRANSMISSION_COUNTER is larger than the value obtained byadding 1 to the preambleTransMax, the UE applies a second period to thepreamble transmission/retransmission. The first period is determined bythe first delay, and the second period is determined by a sum of thesecond delay and the first delay. The first delay and the second delaymay be differently configured in the PCell and the SCell, the firstdelay may be defined as a maximum value rather than a fixed value, andthe second delay may be defined as a fixed value.

Meanwhile, for a mobility support of the UE, the UE continuouslymeasures a channel status of the serving cell and the peripheral cell,compares a measurement result, and reports the measurement result to theeNB when the predetermined condition is satisfied. The eNB configures ameasurement to the UE using a predetermined RRC control messageaccording to a need. The measurement configuration includes ameasurement object (i.e., measObject), a report configuration (i.e.,reportConfig), a measurement indicator (i.e., measurement ID or measId),and the like.

The measurement object is a frequency in which the UE performs themeasurement, and the eNB may configure at least one measurement objectto the UE. An identifier is given to each measurement object. The reportconfiguration is related to a measurement report trigger, and is largelydivided into an event triggered report method and a periodic reportmethod. For example, the event triggered report method may be subdividedinto the following six types of report events.

A1: The measurement result of the serving cell is equal to or largerthan a predetermined reference

A2: The measurement result of the serving cell is equal to or smallerthan a predetermined reference

A3: The measurement result of the peripheral cell is better than themeasurement result of the PCell by a predetermined offset or more

A4: The measurement result of the peripheral cell is equal to or largerthan a predetermined reference

A5: The measurement result of the PCell is equal to or smaller than areference 1 and the measurement result of the peripheral cell is equalto or larger than a reference 2

A6: The measurement result of the peripheral cell is better than themeasurement result of the SCell by an offset or more

Multiple measurements may be configured in the UE, and one measurementincludes the MeasId, the measObjectId and the reportConfigId. Forexample, two measurement objects specified as measObjectId 1 _2305 andmeasObjectId 2 _2310 are configured in a random UE, and the measObjectId1 _2305 and measObjectId 2 _2310 indicate a center frequency 1 and acenter frequency 2, respectively. In addition, two report configurationsspecified reportConfigId 1 _2315 and reportConfigId 2 _2320 exist, andthe reportConfigId 1 _2305 and reportConfigId 2 _2320 indicate events 1and 3, respectively. The eNB configures specific measurements using themeasurement object configuration information and the reportconfiguration information. That is, when the MeasId 1 _2325 is relatedto the measObjectId 1 and the reportConfigId 2, if the MeaseId 1satisfies the event A3 for the center frequency 2, the MeaseId 1 means ameasurement reporting the measurement result.

The UE and the eNB may configure various measurements by variouslyrelating the measurement object to the report configuration. Thecontents related to the measurement are disclosed in the rule 36.331 inmore detail.

The UE may compare the measurement result of the serving cell with apredetermined reference (e.g., A1 and A2), may compare the measurementresult of the peripheral cell with a predetermined reference (e.g., A4),or may compare the measurement result of the serving cell with themeasurement result of the peripheral cell (e.g., A3 and A5) to determinewhether the UE triggers the measurement report message. When the SCellis configured in the UE, it should be definitely defined whether theSCell is handled as the serving cell or the peripheral cell. The presentinvention provides a method and an apparatus in which the SCell is notfixed as the serving cell or the peripheral cell and is handled as theserving cell and the peripheral cell according to an occasion.

FIG. 24 illustrates a UE operation.

In step _2405, a random measurement is configured in the UE, and one ormore SCells are configured in the UE. The configuration of themeasurement means a configuration of MeasId related to the measObjectIdand reportConfigId. The UE checks the reportConfig of the measurement soas to determine whether the SCell is handled as the serving cell or theperipheral cell in the measurement. When the reportConfig is related tothe periodic report, step _2413 is performed. When the reportConfig isA1 or A2, step _2410 is performed. When the reportConfig is A3, A4 orA5, step _2430 is performed. When the reportConfig is A6, step _2445 isperformed.

When the periodic report is configured, the UE handles all SCellsconfigured in the UE as the serving cell (_2413). The UE includesmeasurement results for all configured SCells in the measurement resultreport (i.e., measResult) which is periodically triggered.

When A1 or A2 is configured, the UE performs step _2410. In step _2410,the UE checks whether the SCell having a center frequency (or a carrierfrequency) the same as that of the measurement object related to themeasurement is configured. For example, when the measurement object isf1, the UE checks whether the SCell of which the center frequency is f1exists. When there is the SCell satisfying the condition, in step _2415,the corresponding SCell is considered as the serving cell. When themeasurement result of the SCell is maintained as a status that is betterthan a predetermined reference value for a predetermined period or more(i.e., in the case of A1), or is maintained as a status that is worsethan a predetermined reference value for a predetermined period or more(i.e., in the case of A2), the UE triggers the measurement result reportincluding the measurement result of the SCell and reports themeasurement result report to the eNB.

When there is not the SCell satisfying the condition, step _2420 isperformed and thus the SCell is not handled as the serving cell. Thatis, the measurement result report based on the measurement result of theSCell is not triggered. However, when the measurement result report istriggered for another reason, the measurement result of the SCells isincluded in the measurement result report.

When A3, A4 or A5 is configured, the UE performs step _2430. In step_2430, the UE checks whether the SCell having a center frequency thesame as that of the measurement object related to the measurement isconfigured. When the SCell satisfying the condition is configured, step_2435 is performed, and when the SCell satisfying the condition is notconfigured, step _2440 is performed. In step _2435, the UE handles thecorresponding SCell as the peripheral cell. That is, when themeasurement result of the corresponding SCell is maintained as a statusthat is better than the measurement result of the PCell by apredetermined offset for a predetermined period or more (i.e., in thecase of A3), when the measurement result of the corresponding SCell ismaintained as a status that is better than a predetermined referencevalue for a predetermined period of more (i.e., in the case of A4), whenthe measurement result of the PCell is equal to or lower than apredetermined reference and the measurement result of the correspondingSCell is maintained as a status that is equal to or more than anotherreference for a predetermined period or more (i.e., in the case of A5),the UE triggers the measurement result report including the measurementresult of the SCell and reports the measurement result report to theeNB. When there is not the SCell satisfying the condition, step _2440 isperformed and thus the SCell is not handled as the peripheral cell. Thatis, the measurement result report based on the measurement result of theSCell is not triggered. However, when the measurement result report istriggered for another reason, the measurement result of the SCells isincluded in the measurement result report.

When A6 is configured, in step _2445, the UE does not handle the allSCells as the peripheral cell. That is, the measurement result reportbased on the measurement result of the SCell is not triggered. However,when the measurement result report is triggered for another reason, themeasurement result of the SCells is included in the measurement resultreport.

The handling or not of the SCell as the serving cell or the peripheralcell according to a type of an event as described above is fortriggering or not triggering, the measurement result report by the SCellmeasurement result according to an object of the event configuration.

Meanwhile, a UE positioned in a cell change may undergo a backwardtransmission output shortage problem. A Transmission Time Interval (TTI)bundling function which repeatedly transmits (hereinafter, a bundletransmission) data through 4 TTIs may be configured in such a UE. In theexisting carrier aggregation method, the TTI bundling function is notused in the UE in which multiple serving cells are configured. This isbecause the carrier aggregation is recognized as a usable technology ina case in which the backward transmission output is enough. However, inthe inter-eNB carrier aggregation, the UE positioned in the cell changeperforms a normal operation with a small cell and applies the TTIbundling in a macro cell, and thus communication efficiency may beincreased.

When the cell in which the TTI bundling is configured is the PCell, theUE may start the random access process while performing the TTI bundlingoperation. The UE transmits a message 3 in the random access process.When the transmission of the message 3 and a new TTI bundlingtransmission are overlapped on a time axis, the UE processes the newtransmission prior to the retransmission according to a general rule.That is, the UE gives up the retransmission of the message 3 and startsthe new transmission.

However, when a reason why the UE performs the random access isconsidered, such an operation of the UE is not preferable. The UE maytransmit a buffer status report to the eNB through the message 3 of therandom access process. When the UE gives up the transmission of themessage 3, the buffer status report message is leaked, and thus ascheduling may be negatively influenced.

The present invention provides a method of determining a priortransmission in consideration of types of conflicted transmissions whena new transmission and a retransmission are conflicted on a time.

The case in which the new transmission and the retransmission areconflicted may include various cases. For example, there are a case(e.g., a case 1 of FIG. 25) wherein a new transmission is directed in anHARQ process in which a current retransmission is progressing, a case(e.g., a case 2 of FIG. 25) wherein a bundle initial transmissionoverlapped a bundle retransmission that is currently progressing on atime axis is directed, a case (e.g., a case 3 of FIG. 25) wherein an Msg3 transmission overlapped a bundle retransmission that is currentlyprogressing on a time axis is directed, a case (e.g., a case 4 of FIG.25) wherein a bundle initial transmission overlapped an Msg 3 that iscurrently progressing on a time axis is directed, and the like. In thepresent invention, the UE determines a transmission that is previouslyperformed in consideration of the initial transmission, whether thebundle of the retransmission is transmitted or not, whether there is themessage 3 or not, and the like.

FIG. 26 illustrates an operation of the UE. FIG. 26 is a flowchartillustrating an operation sequence of the UE performing the TTI bundlingoperation.

In step _2600, the TTI bundling is configured in the UE. Morespecifically, when the UE receives an RRC connection reconfiguration(i.e., RRCConnectionReconfiguration) message in which the TTIbundling isconfigured as true, the UE applies a bundle transmission to the backwardgrant received through the PDCCH until the TTI bundling is released,that is until the UE receives RRCConnectionReconfiguration message inwhich the TTIbundling is configured as false.

In step _2605, the UE recognizes that an initial transmission and aretransmission are conflicted on a time axis in a close future. Forexample, an initial transmission is directed in a subframe of which aretransmission is already scheduled, and the like correspond to this.

In step _2610, the UE checks whether the conflict is generated in thesame HARQ process.

For example, the case wherein the initial transmission is directed inthe HARQ process of which a retransmission is currently beingprogressed, as the case 1 corresponds to here. The case 1 is an examplefor a non bundling transmission, but the same occasion may be generatedin the bundling transmission. When the conflict is the conflictgenerated in the same process, the UE performs step _2625. When theconflict is not the conflict generated in the same process, the UEperforms step _2615. In step _2615, the UE checks whether the conflictis generated by the bundle initial transmission and the bundleretransmission.

For example, the case wherein the bundle initial transmission isdirected in a subframe of which some overlaps a subframe of which aretransmission is progressed, as the case 2 corresponds to here. When anormal TTI bundling is configured, the eNB performs a scheduling so asnot to generate the above situation. However, for example, when thecurrently progressed retransmission is caused by noise (e.g.,misunderstanding of the UE in which the transmission is directed due toremain an error of a CRC although the eNB does not direct thetransmission), the situation may be generated. In this case, it ispreferable to follow the rule in which the initial transmission is priorto the retransmission, and the UE performs step _2625. When the conflictis not the conflict between the bundles, the remaining case is aconflict between the bundle transmission and the message 3. It isbecause the bundle transmission is always applied by a normal backwardgrant when the TTI bundling is applied to the UE as described above. Instep _2620, the UE checks whether the initial transmission is the bundletransmission and the retransmission is the message 3 transmission (orwhether a re-transmitted MAC PDU is obtained from a message 3 buffer).When the initial transmission is the bundle transmission and theretransmission is the message 3 transmission (or whether are-transmitted MAC PDU is obtained from a message 3 buffer), step _2630is performed, otherwise, that is, when the new transmission is themessage 3 transmission and the retransmission is the bundletransmission, step _2625 is performed. In step _2625, the UE performsthe new transmission. If the new transmission is the message 3transmission and the retransmission is the bundle transmission, sinceremaining subframes _2505, _2510 and _2515 except for the subframe inwhich the message 3 initial transmission is performed do not overlap themessage 3 initial transmission, the bundle transmission may still beperformed. However, the bundle transmission is not performed in thesubframe overlapping the message 3, although remaining bundletransmission is performed, a probability in which the transmission isfinally succeeded is rare. Thus, in order to reduce battery consumption,the UE does not perform the bundle transmission in the remainingsubframe, and discards data of the HARQ process (i.e., stops the currentbundle transmission of the HARQ process). Alternatively, the UE may notperform a transmission in subframes _2510 and _2515 before and after themessage 3 transmission and may perform a transmission in a remainingsubframe _2505. In step _2630, the UE previously performs the message 3retransmission. In remaining subframes _2520, _2525 and _2530 which arenot overlapped the message 3 transmission, in order to reduce batteryconsumption of the UE, the bundle transmission is not performed and thedata of the HARQ process is discarded. Alternatively, the UE may do notperform a transmission in subframes _2520 and _2525 before and after themessage 3 transmission and may perform a transmission in a remainingsubframe _2530.

In step _2615, the initial transmission may not be previously performedand a transmission that is already progressing may be previouslyperformed. That is, in step _2615, when the bundle transmission and thebundle transmission are conflicted, step _2630 may be performed. This isbecause a possibility wherein the transmission that is alreadyprogressing is generated by noise is higher than a possibility wherein asubsequent transmission is generated by noise, stochastically, since theeNB performs the scheduling so as not to generate the conflict betweenthe bundle transmissions, when once the TTI bundling is configured asdescribed above. For example, when the transmission that is alreadyprogressing is prior, if the initial grant noise is not generated bynoise after the TTI bundling is configured, all grants generatedsubsequent noise may be filtered. In contrast, when the new transmissionis prior, it is influenced by all noise grants generated after the TTIbundling is configured.

Another embodiment of the present invention provides a method ofperforming the random access in the PCell, PSCell or SCell by the UE.

The UE determines the serving cell in which the UE performs the randomaccess according to an object of the random access.

TABLE 8 The serving cell in which the random access is Case performedRRC connection configuration PCell Regular BSR trigger by data of PCellMCG bearer Regular BSR trigger by data of PSCell SCG bearer Serving cellin which PDCCH PDCCH order reception order is received Handover PCellSeNB/SCG additon or change PSCell Reconfiguration related to PSCellSeNB/SCG

As shown in Table 8, the random access in the serving not the PCell orthe PSCell is started by only the PDCCH order.

When the regular BSR is triggered by the data of the SCG bearer, inorder to transmit to the SeNB of the regular BSR, the UE triggers therandom access in the PSCell.

The handover, SeNB/SCG addition/change, and the reconfiguration relatedto SeNB/SCG related are triggered by a reception of the RRC controlmessage. In the case of the handover, a handover completion controlmessage is generated through an uplink, the regular BSR due to the dataof the MCG bearer is triggered by the control message, and thus therandom access is triggered in the PCell.

In contrast, in the case of the SeNB/SCG addition/change or theconfiguration related to SeNB/SCG, a response RRC control message forthis does not trigger the random access in the PSCell. Thus, controlinformation directing a trigger of the random access in the PSCell isincluded in the related RRC control message. When the SeNB is added orchanged, some of bearer configured in the UE is reconfigured to the SCGbearer, if transmittable uplink data is stored in the SCG bearer, theregular BSR by the SCG bearer may be triggered. Thus, when the PSCellrandom access by the RRC control message is already progressed, theRSCell random access by the regular BSR may be triggered. If the UEstops the random access that is currently progressing and starts therandom access by the regular BSR, a completion of the SeNBaddition/change may be delayed. Thus, when the PSCell random access bythe RRC control message is already progressing, it is preferable tofirst complete the random access that is currently progressing.

FIGS. 27, 28A and 28B illustrate the UE operations related to the above.

FIG. 27 illustrates an operation of the UE receiving the RRC controlmessage.

In step _2705, the UE receives the RRC control message.

In step _2710, the UE checks whether the RRC control message is amessage directing a handover. When the RRC control message is themessage directing a handover, the UE performs step _2715, and when theRRC control message is not the message directing a handover, the UEperforms step _2725.

The control message including MobilityControlInfo (refer to rule 36.331)is the control message directing the handover.

In step _2715, the UE generates a response message for the controlmessage. The response message is the RRC control message. Since the RRCcontrol message has the highest priority and is always transmitted orreceived through the MCG, the regular BSR for the MCG is triggered bythe response control message. The regular BSR for the MCG means aregular BSR triggered by data to be transmitted through the MCG, aregular BSR triggered by an MAC device configured for the MCG, a regularBSR triggered for the MeNB, or a regular BSR triggered by the LCG_m.

In step _2720, in order to transmit the regular BSR, after the UEperforms the handover and triggers the random access in the PCell. Thatis, the UE starts processes such as transmitting the random preamble ina predetermined time/frequency resource of the PCell and receiving therandom access response message through the downlink of the PCell.

In step _2725, the UE checks whether the following predeterminedinformation is included in the RRC control message.

-   -   Control information initially configuring SeNB: information on        the eNB, for example, MAC configuration information to be used        for the SeNB, and the like are included here.    -   Control information initially adding the SCG serving cell:        control information configuring at least one SCG SCell to a UE        in which the SCG serving cell is not configured, information on        configured SCell, information indicating that the SCell is        included in the SCG, and the like correspond here.    -   Control information directing a change of the SeNB: information        directing a release of all existing SCG serving cells and a        configuration of new SCG serving cells corresponds here.    -   Information directing a random access start may be, for example,        1 bit information.

When the predetermined information is included in the RRC controlmessage, step _2730 is performed, and when the predetermined informationis not included in the RRC control message, step _2740 is performed.

In step _2730, the UE triggers the random access in a predetermined cellamong the SCG serving cells, that is, the PSCell. That is, the UE startsprocesses such as transmitting the random preamble in a predeterminedtime/frequency resource of the PSCell and receiving the random accessresponse message through the downlink of the PSCell.

When the regular BSR is triggered while the random access process isperformed, the UE controls such that a new random access by the regularBSR for the SCG is not triggered. That is, when the random access ofwhich the start is directed by the RRC is progressing in the PSCell, therandom access trigger by the regular BSR for the SCG is ignored untilthe random access process is completed (_2735).

The regular BSR for the SCG means a regular BSR triggered by data to betransmitted through the SCG, a regular BSR triggered by an MAC deviceconfigured for the SCG, a regular BSR triggered for the SeNB, or aregular BSR triggered by the LCG_s.

In step _2740, the UE triggers the regular BSR for the MCG. If the SRtransmission resource is not allocated in the PUCCH of the PCell, the UEtriggers the random access in the PCell.

FIGS. 28A and 28B illustrate a UE operation when the regular BSR istriggered.

In step _2805, a regular BSR is triggered.

In step _2810, the UE checks whether the regular BSR is a BSR for theSCG and a BSR for the MCG. When the regular BSR is the BSR for the SCG,step _2815 is performed, and when the regular BSR is the BSR for theMCG, step _2860 is performed.

In step _2815, the UE checks whether there is a random access processthat is currently progressing. When there is the random access processthat is currently progressing, the UE performs step _2825, and whenthere is not the random access process that is currently progressing,the UE performs step _2820.

In step _2820, the UE triggers the random access in the PSCell.

In step _2825, the UE checks whether the random access is progressing inthe SCG serving cell or the MCG serving cell. When the random access isprogressing in the SCG serving cell, step _2830 is performed, and whenrandom access is being progressed in the MCG serving cell, step _2820 isperformed, to trigger the random access in the PSCell.

In step _2830, the UE checks whether the random access that is currentlyprogressing is directed by the RRC control message. That is, the UEchecks whether the random access that is currently progressing isdirected by predetermined control information (e.g., 1 bit informationdirecting a random access start) included in the received RRC controlmessage. When the random access that is currently progressing isdirected by the RRC control message, step _2840 is performed, and whenthe random access that is currently progressing is not directed by theRRC control message (e.g., when the random access that is currentlyprogressing is started by the PDCCH order or triggered by anotherregular BSR), step _2835 is performed.

In step _2840, the UE continuously performs the random access processstarted by the RRC control message. When the random access process thatis being performed is completed, the UE performs step _2855.

In step _2855, the UE checks whether a BSR (e.g., a BSR reported in therandom access process) which is reported in the most recent timereflects a current buffer status. The triggering of the regular BSRmeans that new data of which a priority is high is generated. The randomaccess process that is progressing at a time when the regular BSR istriggered also includes BSR information. Therefore, when the BSRtransmitted in the random access process includes information on datatriggering the regular BSR, since it is not necessary to newly trigger arandom access, step _2857 is performed so as not to trigger the randomaccess any more and to end the process. In contrast, when theinformation on data causing the regular BSR trigger is not included inthe BSR transmitted in the random access process, step _2859 isperformed to trigger a new random access in the PSCell. Alternatively, aregular BSR for the SCG may be newly triggered.

In step _2835, the UE checks whether the random access that is currentlyprogressing is a Contention Based Random Access (CBRA) or a ContentionFree Random Access (CFRA). In the case of the CBRA, step _2845 isperformed, and in the case of the CFRA, step _2840 is performed. Therandom access triggered by the regular BSR is always the CBRA. When therandom access that is currently progressing is the CFRA, in order topreviously perform the random access by the CFRA, step _2840 isperformed.

In step _2845, the UE checks whether data is stored in the message 3buffer. When the data is stored in the message 3 buffer, step _2850 isperformed, and when the data is not stored in the message 3 buffer, step_2853 is performed. The storing of the data in the message 3 buffermeans that a BSR reflecting contents triggering the regular BSR cannotbe transmitted in the random access process because a configuration ofan MAC PDU to be transmitted using uplink transmission resourcesallocated in the random access response. In contrast, an absence of thedata in the message 3 buffer means that the MAC PDU to be transmitted inthe random access process is not configured yet, and means that thecontents of the BSR to be stored in the MAC PDU may be corrected so asto reflect the most recent buffer status.

In order to transmit the BSR reflecting an accurate buffer status, instep _2850, the UE stops the random access that is currently progressingand newly starts a random access in the PSCell.

In step _2853, the UE continuously progresses the random access processthat is currently progressing. In addition, the UE stores the BSRreflecting the most recent buffer status in the MAC PDU to betransmitted through the random access process, and transmits the BSR.

In step _2860, the UE checks whether there is a random access processthat is currently progressing. When there is the random access processthat is currently progressing, the UE performs step _2865, and whenthere is not the random access process that is currently progressing,the UE performs step _2870.

In step _2870, the UE triggers the random access in the PCell.

In step _2865, the UE checks whether the random access is progressing inthe SCG serving cell or the MCG serving cell. When the random access isprogressing in the SCG serving cell, step _2870 is performed, and whenrandom access is progressing in the MCG serving cell, step _2873 isperformed.

In step _2873, the UE checks whether the random access that is currentlyprogressing is a Contention Based Random Access (CBRA) or a ContentionFree Random Access (CFRA). In the case of the CBRA, step _2880 isperformed, and in the case of the CFRA, step _2875 is performed.

In step _2880, the UE checks whether data is stored in the message 3buffer. When the data is stored in the message 3 buffer, step _2883 isperformed, and when the data is not stored in the message 3 buffer, step_2885 is performed.

In step _2883, the UE stops the random access that is currentlyprogressing and newly starts a random access in the PCell.

In step _2885, the UE continuously progresses the random access processthat is currently progressing. In addition, the UE stores the BSRreflecting the most recent buffer status in the MAC PDU to betransmitted through the random access process, and transmits the BSR.

In step _2875, the UE continuously progresses the CFRA process that iscurrently progressing, and when the random access process is completed,the UE performs step _2890.

In step _2890, the UE checks whether a BSR (i.e., a BSR reported in therandom access process) which is reported in the most recent timereflects a current buffer status. When the BSR which is reported in themost recent time reflects the current buffer status, in step _2893, theUE does not trigger the random access any more and ends the process.When the BSR which is reported in the most recent time does not reflectthe current buffer status, in step _2895, the UE triggers a new randomaccess in the PCell. Alternatively, a regular BSR for the MCG may benewly triggered.

The UE triggers the random access by oneself or the random access istriggered according to a direction of the eNB.

The eNB uses a layer 1 control signal or a layer 3 control message inorder to trigger the random access in a predetermined serving cell.

FIG. 29 illustrates an operation of the UE determining the cell in whichthe random access is triggered according to the direction of the eNB.

In step _2905, the random access is triggered by the downlink signaltransmitted from the eNB. Alternatively, the random access may betriggered by the direction of the eNB.

In step _2910, the UE checks whether the downlink signal triggering therandom access is the layer 1 signal such as the PDCCH order or the layer3 signal such as the RRC control message.

In step _2915, the UE checks whether a Carrier Indicator Field (CIF,refer to the rule 36.331) field is included in the layer 1 signal. Whenthe CIF field is included in the layer 1 signal, step _2925 isperformed, and when the CIF field is not included in the layer 1 signal,step _2920 is performed. In step _2920, the UE triggers the randomaccess in the serving cell in which the layer 1 signal is received. TheUE transmits the random access preamble through the uplink of theserving cell in which the layer 1 signal is received. When the servingcell is the serving cell of the MCG, the UE receives the random accessresponse message through the PCell. When the serving cell is the servingcell of the SCG, the UE receives the random access response messagethrough the PSCell.

In step _2925, the UE triggers the random access in the serving celldirected in the CIF of the layer 1 signal.

In step _2930, the UE checks whether MobilityControlInfo is included inthe L3 control message and whether control information explicitlyindicating the triggering of the random access is included in the L3control message, and performs step _2935 or step _2940 as describedbelow.

When the MobilityControlInfo is included in the L3 control message, step_2935 is performed to transmit the preamble in the PCell and receive therandom access response message in the PCell.

When the explicit control information (e.g., 1 bit information)indicating the random access in included in the L3 control message, step_2940 is performed to trigger the random access in the PSCell.

A UE, an eNB operation and an apparatus for transmitting and receiving aPHR in a multiple connection status are provided as another furtherembodiment of the present invention.

The PHR is an MAC control message for reporting a UE transmission PowerHeadroom (PH) to control a UE uplink transmission power. The eNBschedules the uplink transmission of the UE in consideration of the PHreported by the UE such that transmission power of the UE is not largerthan maximum transmission power.

Two types of PHs called a type 1 PH and a type 2 PH are defined in thePH. The type 1 PH is a PH related to a Physical Uplink Shared Channel(PUSCH, refer to rule 36.213) transmission, and may be defined as adifference value between transmission power and maximum transmissionpower of the UE requested in the case of a predetermined PUSCHtransmission. The type 2 PH is a Physical Uplink Control Channel (PUCCH,refer to rule 36.213) transmission, and may be defined as a differencevalue between transmission power and maximum transmission power whenpredetermined PUSCH transmission and PUCCH transmission aresimultaneously performed.

FIG. 30 illustrates formats of the PHR.

The PHR includes three types of formats. A normal format 301 is storingthe type 1 PH for one serving cell. An extended format 3002 is storingthe type 1 PH for a plurality of serving cells and the type 2 PH for thePCell. A first octet of the extended format is used as a bitmapindicating whether there is a serving cell. The next octet includes thetype 2 PH information of the PCell. The subsequent octet includes thetype 1 PH information of the PCell. After the PH information for thePCell is included, the PH information for the SCell designated in thefirst octet is sequentially listed in a sequence of an SCell index. Themaximum power (i.e., PCmax) of the UE is included in a correspondingcell together with each PH information and is reported.

The multiple connection format 3003 stores the type 1 PH of all servingcells which are active status at time when the PHR is triggered and thetype 2 of the PCell and the PSCell. The first octet of the multipleconnection format may be used as a bitmap indicating whether there isthe serving cell. The next octet may include the type 2 PH informationfor the PCell. The PCmax may be stored in the subsequent octet. The type2 PH information of the PSCell is stored in the next octet 3005, andthen stored in a sequence of the size of the serving cell identifier.

As described above, PHs of multiple SCells are stored in multipleconnection format. A type 1 PH of the SCell is stored in a sequence of aserving cell identifier size of the SCell. In contrast, a type 2 PH ofthe SCell is stored in a predetermined position, rather than thesequence of the serving cell identifier size. Thus, the type 1 PH andthe type 2 PH of the PSCell are stored and spaced apart by two or moreoctets rather than an adjacent octet.

It is compared to the case wherein a type 1 PH and a type 2 PH of onecell are stored in adjacent octets in the extended format.

The type 1 PH and the type 2 PH may accompany or may not accompany anoctet in which the PCmax is stored. Therefore, the storing of two randomPHs in adjacent octets means adjacency-or-not in a status in which theoctet storing the PCmax is not considered. That is, the storing of thetype 1 PH and the type 2 PH of the PSCell in octets that are notadjacent means that the PHs are not adjacent even though the PCmax octetis not accompanied to each PH.

In the extended format, the type 2 PH of the PCell is an optional field.When the eNB configures a simultaneous transmission of the PUSCH and thePUCCH to the UE, the type 2 PH of the PCell is always included in theextended format. On the contrary, when the eNB does not configure thesimultaneous transmission of the PUSCH and the PUCCH to the UE, the type2 PH of the PCell is not included in the extended format. This isbecause an efficiency of the type 2 PH is reduced when a probability ofthe simultaneous transmission of the PUSCH and the PUCCH, since apossibility of a generation of the transmission power status of the UEusing only the PUCCH is remarkably low.

In the multiple connection format, the type 2 PH of the PCell and thetype 2 PH of the PSCell are always included regardless of whether thesimultaneous transmission is configured or not. This is because thesimultaneous transmission is possible between cell groups although thePUCCH and the PUSCH are not simultaneously transmitted.

Therefore, the UE connects type 2 PH report-or-not with PUCCH and thePUSCH simultaneous transmission configuration (i.e., simultaneousPUCCH-PUSCH) or non-configuration until the multiple connections areconfigured. However, when the multiple connections are configured, thetype 2 PH of the PCell and the type 2 PH of the PSCell are alwaysreported regardless of whether the PUCCH and PUSCH simultaneoustransmission is configured or not.

Before the multiple connections are configured, the UE reports the PHRusing one of the normal format and the extended format. The eNBtransfers a parameter called extended PHR using the RRC control messageto the UE, and when the parameter is transferred, the UE using theextended format. It is preferable to use the multiple connection formatwhen the multiple connections are configured differently from the normalformat and the extended format. Thus, it is not necessary to signalusing an additional parameter. Therefore, the UE uses one of the normalformat and the extended format according to a direction of the eNB whenthe multiple connections are not configured, and the UE uses themultiple connection format regardless of the direction of the eNB whenthe multiple connections are configured.

FIG. 31 illustrates an operation of the UE.

In step 3105, the PHR is triggered. For example, the PHR is triggeredwhen a path loss is changed by a predetermined reference or more, or istriggered periodically.

In step 3110, the UE checks whether the multiple connections arecurrently configured. The configuration of the multiple connections hasa meaning the same as a configuration of at least one SCG, aconfiguration of two MAC devices, a configuration of two cell groups, aconfiguration of the PSCell, and the like.

When the multiple connections are configured, step 3135 is performed,and when the multiple connections are not configured, step 3115 isperformed. In step 3115, the UE checks whether an extended PHR format isconfigured. When the extended PHR format is configured, step 3123performed, and when the extended PHR is not configured, step 3120 isperformed.

In step 3120, the UE generates and transmits the PHR of the normalformat storing the type 1 PH of the PCell.

In step 3123, the UE checks whether the simultaneous transmission of thePUCCH and PUSCH is configured. Alternatively, the UE checks whether thesimultaneousPUCCH-PUSCH is configured. The simultaneousPUCCH-PUSCH maybe configured according to each MAC entity or each cell group. Sincestep 3123 is not the multiple connections, only one cell group exists.When the simultaneousPUCCH-PUSCH is configured, step 3130 is performed,and when the simultaneousPUCCH-PUSCH is not configured, step 3125 isperformed.

In step 3125, the UE generates and transmits the PHR of the extendedformat storing the type 1 PHs of the SCell of the active state and thetype 1 PH of the PCell.

In step 3130, the UE generates and transmits the PHR of the extendedformat storing the type 1 PHs of the SCell of the active state, and thetype 1 PH and the type 2 PH of the PCell. At this time, the type 1 PHand the type 2 PH of the same cell are stored in adjacent octets. Theadjacent octets in the above and in the below are octets (e.g., an n-thoctet and an (n+2)-th octet) spaced apart by one octet when the PCmax isreported, and are physically wholly adjacent octets (e.g., the n-thoctet and an (n+1)-th octet) when the PCmax is not reported.

In step 3135, the UE generates and transmits the PHR of the multipleconnection format storing the type 1 PHs of the SCell of the activestate, the type 1 PH and the type 2 PH of the PCell, and the type 2 PHof the PSCell. When the UE determines whether the UE reports the type 2PH of the PCell and the type 2 PH of the PSCell, thesimultaneousPUCCH-PUSCH configuration or non-configuration of the MCGand the simultaneousPUCCH-PUSCH configuration or non-configuration ofthe SCG are not considered. That is, the UE reports the type 2 PH of thePCell or PSCell although the simultaneousPUCCH-PUSCH is configured inthe MCG or SCG. Therefore, the UE in which the simultaneousPUCCH-PUSCHis not configured in the PCell generates and reports the PHR wherein thetype 2 PH of the PCell is not included when the multiple connections arenot configured, and the UE generates and reports the PHR including thetype 2 PH of the PCell when the multiple connections are configured. TheUE in which the simultaneousPUCCH-PUSCH is configured in the PCellgenerates and reports the PHR including the type 2 PH of the PCellregardless of whether the multiple connections are configured or not. Ingenerating the multiple connection format PHR, the UE stores a type 1 PHand a type 2 PH of a first predetermined serving cell in adjacentoctets, and stores a type 1 PH and a type 2 PH of a second predeterminedserving cell in octets which are not adjacent. The first serving cell isthe PCell and the second serving cell is the PSCell.

FIG. 19 is a view illustrating a UE structure according to an embodimentof the present specification. Referring to FIG. 19, the UE according toan embodiment of the present specification includes a transmitting andreceiving unit _1905, a control unit _1910, a multiplexing andde-multiplexing unit _1915, a control message processing unit _1930 andvarious types of higher layer processing units _1920 and _1925.

The transmitting and receiving unit _1905 receives data and apredetermined control signal through the downlink channel of the servingcell, and transmits the data and the predetermined control signalthrough the uplink channel. In the case wherein a plurality of servingcells are configured, the transmitting and receiving unit _1905transmits and receives data and a control signal through the pluralityof serving cells.

The multiplexing and de-multiplexing unit _1915 multiplexes datagenerated in the higher layer processing units _1920 and _1925 and thecontrol message processing unit _1930 or de-multiplexes the datareceived from the transmitting and receiving unit _1905, to transfer thedata to proper higher layer processing units _1920 and _1925 or thecontrol message processing unit _1930. An independent multiplexing andde-multiplexing unit (or the MAC device) is configured in the MeNB andthe SeNB, but one multiplexing and de-multiplexing unit (or MAC device)is configured in the UE.

The control message processing unit _1930 is an RRC layer device, andprocesses a control message received from the eNB to perform a necessaryoperation. For example, the control message processing unit _1930receives the RRC control message and transfers, to the control unit,random access related information, PUCCH configuration information,pattern information, PHR configuration information, and the like.

The higher layer processing units _1920 and _1925 may be configuredaccording to each service. The higher layer processing units _1920 and_1925 process data generated from a user service such as a File TransferProtocol (FTP) or a Voice over Internet Protocol (VoIP) to transfer thedata to the multiplexing and de-multiplexing unit _1915, or process thedata transferred from the multiplexing and de-multiplexing unit _1915 totransfer the data to a service application of a higher layer.

The control unit _1910 identifies a scheduling instruction receivedthrough the transmitting and receiving unit _1905, for example, backwardgrants, and controls the transmitting and receiving unit 1205 and themultiplexing and de-multiplexing unit _1915 so as to perform a backwardtransmission through a suitable transmission resource at an appropriatetime point. In addition, the control unit manages all procedures relatedto the SCell configuration, all procedures related to the random access,all procedures related to the PUCCH transmission, all procedures relatedto the SCG, all procedures related to the PHR transmission, and thelike. More specifically, the control unit performs necessary controloperations related to the operations of the UE shown in FIGS. 5 to 31.

The control unit _1910 according to an embodiment of the presentinvention may control sequential processes of establishingsynchronization with a serving cell included in a serving cell additioncontrol message when the control unit _1910 receives the serving celladdition control message including uplink subframe pattern informationfor a master serving cell group or a slave serving cell group. Inaddition, the control unit _1910 may control to transmit and receive toand from the eNB through the added serving cell when the control unit1910 receives an instruction for activating the serving cell in whichthe synchronization is established.

In this case, the uplink subframe pattern information may include atleast one of information on a subframe to which an uplink transmissionfor the master serving cell group is admitted, information on a subframeto which an uplink transmission for the slave serving cell group isadmitted, and information on a subframe to which an uplink transmissionis not admitted.

In addition, the length of the uplink subframe pattern may be determinedbased on a Hybrid Automatic ReQuest (HARQ) Round Trip Time (RTT).

According to an embodiment of the present invention, the uplink subframepattern information may include at least one of bit informationindicating a subframe to which an uplink transmission for the masterserving cell group is admitted, bit information on a subframe to whichan uplink transmission for the slave serving cell group is admitted, andoffset information indicating a start of a subframe pattern.

According to an embodiment of the present invention, the uplink subframepattern information may be pattern index information indicating onepattern among multiple subframe patterns having a predetermined length.

In addition, the control unit _1910 according to an embodiment of thepresent invention may receive transmission resource configurationinformation for an uplink control information transmission from the basestation and may determine a resource transmitting the uplink controlinformation based on the uplink subframe pattern information and thetransmission resource configuration information for the uplink controlinformation transmission. In addition, the control unit _1910 maycontrol to transmit the uplink control information based on thedetermined resource. The uplink control information may include at leastone of a Channel Quality Indicator (CQI), a Scheduling Request (SR), aSounding Reference Signal (SRS), and a Buffer Status Report (BSR).

Further, the control unit _1910 according to an embodiment of thepresent invention may control to generate a terminal capabilityinformation message including information on at least one bandcombination supported by the terminal, and to transmit the generatedterminal capability information message to the base station.

Also, the control unit _1910 according to an embodiment of the presentinvention may determine previously performing one of the initialtransmission or retransmission as shown in FIG. 26 when the initialtransmission and the retransmission are conflicted.

FIG. 20 is a view illustrating an MeNB structure according to anembodiment of the present specification. The MeNB according to anembodiment of the present specification may include a transmitting andreceiving unit _2005, a control unit _2010, a multiplexing andde-multiplexing unit _2020, a control message processing unit _2035,various types of higher layer processing units _2025 and _2015 and ascheduler _2015.

The transmitting and receiving unit _2005 transmits data and apredetermined control signal through a forward carrier and receives dataand a predetermined control signal through a backward carrier. In caseswherein a plurality of carriers is configured, the transmitting andreceiving unit _2005 transmits and receives data and a control signalthrough the plurality of carriers.

The multiplexing and de-multiplexing unit _2020 multiplexes datagenerated in the higher layer processing units _2025 and _2030 and thecontrol message processing unit _2035 or de-multiplexes the datareceived from the transmitting and receiving unit _2005, to transfer thedata to proper higher layer processing units _2025 and _2030, thecontrol message processing unit _2035 or the control unit _2010. Thecontrol message processing unit _2035 processes a control messagetransmitted from the UE to perform a necessary operation, or generatesthe control message to be transferred to the UE to transfer to a lowerlayer.

The higher layer processing units _2025 and _2030 may be configuredaccording to each bearer. The higher layer processing units _2025 and_2030 transfers data transferred from an S-GW or another eNB to themultiplexing and de-multiplexing unit _2020, or transfers an RLC PDUtransferred from the multiplexing and de-multiplexing unit _2020 to theS-GW or another eNB.

The scheduler allocates a transmission resource to the UE at anappropriate time point in consideration of a buffer status, a channelstatus and the like of the UE. The scheduler processes a signaltransmitted from the UE to the transmitting and receiving unit, orprocesses to enable the UE to transmit the signal.

The control unit also manages all procedures related to the SCellconfiguration, and the like. More specifically, the control unitperforms a control operation required in an operation that should beperformed by the MeNB in FIGS. 5 to 31.

FIG. 21 is a view illustrating an SeNB structure according to anembodiment of the present specification. The SeNB according to anembodiment of the present specification may include a transmitting andreceiving unit _2105, a control unit _2110, a multiplexing andde-multiplexing unit _2120, a control message processing unit _2135,various types of higher layer processing units _2130 and a scheduler_2115.

The transmitting and receiving unit _2105 transmits data and apredetermined control signal through a forward carrier and receives dataand a predetermined control signal through a backward carrier. In caseswherein a plurality of carriers is configured, the transmitting andreceiving unit _2105 transmits and receives data and a control signalthrough the plurality of carriers.

The multiplexing and de-multiplexing unit _2120 multiplexes datagenerated in the higher layer processing units _2125 and _2130 and thecontrol message processing unit _2135 or de-multiplexes the datareceived from the transmitting and receiving unit _2105, to transfer thedata to proper higher layer processing units _2130 or the control unit_2110. The control message processing unit _2135 processes a controlmessage transmitted from the MeNB to perform a necessary operation.

The scheduler allocates a transmission resource to the UE at anappropriate time point in consideration of a buffer status, a channelstatus and the like of the UE. The scheduler processes a signaltransmitted from the UE to the transmitting and receiving unit, orprocesses to enable for the UE to transmit the signal.

The control unit also manages all procedures related to the SCellconfiguration, and the like. More specifically, the control unitperforms a control operation required in an operation which is should beperformed by the SeNB in FIGS. 5 to 31.

Embodiments of the present invention disclosed in the specification andthe drawings are only particular examples to easily describe thetechnical matters of the present invention and assist in theunderstanding of the present invention, and do not limit the scope ofthe present invention. It is apparent to those skilled in the art thatother modified examples based on the technical idea of the presentinvention can be implemented as well as the embodiments disclosedherein.

The invention claimed is:
 1. A method for reporting a power headroomreport (PHR) by a user equipment (UE), the method comprising:identifying whether an extended PHR is configured to the UE; identifyingwhether a simultaneous transmission of a physical uplink control channel(PUCCH) for the UE and a physical uplink shared channel (PUSCH) for theUE is configured to the UE, if the extended PHR is configured to the UE;and transmitting, to a base station, a PHR including a type 2 powerheadroom for a primary cell (PCell), if the simultaneous transmission ofthe PUCCH and the PUSCH is configured to the UE.
 2. The method of claim1, further comprising: identifying whether a dual connectivity PHR isconfigured to the UE, if the extended PHR is not configured to the UE;and transmitting, to the base station, a PHR including a type 2 powerheadroom for the PCell or a primary secondary cell (PSCell), if the dualconnectivity PHR is configured to the UE.
 3. The method of claim 1,wherein the type 2 power headroom is associated with a PUCCHtransmission for the UE.
 4. The method of claim 1, wherein the PHRfurther includes a type 1 power headroom, and wherein the type 1 powerheadroom is associated with the PUSCH transmission for the UE.
 5. Amethod for receiving a power headroom report (PHR) by a base station,the method comprising: determining whether an extended PHR is configuredto a user equipment (UE); determining whether a simultaneoustransmission of a physical uplink control channel (PUCCH) for the UE anda physical uplink shared channel (PUSCH) for the UE is configured to theUE, if the extended PHR is configured to the UE; and receiving, from theUE, a PHR including a type 2 power headroom for a primary cell (PCell),if the simultaneous transmission of the PUCCH and the PUSCH isconfigured to the UE.
 6. The method of claim 5, further comprising:determining whether a dual connectivity PHR is configured to the UE, ifthe extended PHR is not configured to the UE; and receiving, from theUE, a PHR including a type 2 power headroom for the PCell or a primarysecondary cell (PSCell), if the dual connectivity PHR is configured tothe UE.
 7. The method of claim 5, wherein the type 2 power headroom isassociated with a PUCCH transmission for the UE.
 8. The method of claim5, wherein the PHR further includes a type 1 power headroom, and whereinthe type 1 power headroom is associated with the PUSCH transmission forthe UE.
 9. A user equipment (UE) for reporting a power headroom report(PHR), the UE comprising: a transceiver configured to transmit andreceive a signal; and a controller coupled to the transceiver andconfigured to: identify whether an extended PHR is configured to the UE,identify whether a simultaneous transmission of a physical uplinkcontrol channel (PUCCH) for the UE and a physical uplink shared channel(PUSCH) for the UE is configured to the UE, if the extended PHR isconfigured to the UE, and transmit, to a base station, a PHR including atype 2 power headroom for a primary cell (PCell), if the simultaneoustransmission of the PUCCH and the PUSCH is configured to the UE.
 10. TheUE of claim 9, wherein the controller is configured to: identify whethera dual connectivity PHR is configured to the UE, if the extended PHR isnot configured to the UE, and transmit, to the base station, a PHRincluding a type 2 power headroom for the PCell or a primary secondarycell (PSCell), if the dual connectivity PHR is configured to the UE. 11.The UE of claim 9, wherein the type 2 power headroom is associated witha PUCCH transmission for the UE.
 12. The UE of claim 9, wherein the PHRfurther includes a type 1 power headroom, and wherein the type 1 powerheadroom is associated with the PUSCH transmission for the UE.
 13. Abase station for receiving a power headroom report (PHR), the basestation comprising: a transceiver configured to transmit and receive asignal; and a controller coupled to the transceiver and configured to:determine whether an extended PHR is configured to a user equipment(UE), determine whether a simultaneous transmission of a physical uplinkcontrol channel (PUCCH) for the UE and a physical uplink shared channel(PUSCH) for the UE is configured to the UE, if the extended PHR isconfigured to the UE, and receive, from the UE, a PHR including a type 2power headroom for a primary cell (PCell), if the simultaneoustransmission of the PUCCH and the PUSCH is configured to the UE.
 14. Thebase station of claim 13, wherein the controller is configured to:determine whether a dual connectivity PHR is configured to the UE, ifthe extended PHR is not configured to the UE, and receive, from the UE,a PHR including a type 2 power headroom for the PCell or a primarysecondary cell (PSCell), if the dual connectivity PHR is configured tothe UE.
 15. The base station of claim 13, wherein the type 2 powerheadroom is associated with a PUCCH transmission for the UE.
 16. Thebase station of claim 13, wherein the PHR further includes a type 1power headroom, and wherein the type 1 power headroom is associated withthe PUSCH transmission for the UE.